In this task, you are given an article. Your task is to summarize the article in a sentence.

Mrs Foster dealt with the Renewable Heat Incentive issue "entirely appropriately", said Simon Hamilton.
Ulster Unionist leader Mike Nesbitt has said Mrs Foster should consider her position over the controversy, but Mr Hamilton accused him of "stuntery".
The scheme was meant to encourage users to switch to biomass heating systems.
It was run by the Department of Enterprise, Trade and Investment (DETI) and BBC Spotlight reported that concerns were expressed over the scheme to Mrs Foster in 2013, when she was enterprise minister.
She referred the issue to civil servants but the warnings were not acted on.
The whistleblower outlined serious flaws with the scheme in an email to the department in 2014.
The scheme paid out more in subsidies than the fuel cost, meaning users could earn more money by burning more fuel.
The email was not acted on and the scheme continued until it closed earlier this year amid accusations that it was being abused.
Mr Hamilton said it was "very, very unfair" to claim Mrs Foster had done nothing in regard the whistleblowers' claims.
"They were certainly not ignored," he said.
"If you look at the evidence of the now permanent secretary for the Department of the Economy (formerly DETI) to the Public Accounts Committee on 9 November, he said that Arlene Foster handled the issue of the whistleblower entirely appropriately by taking that on board and by passing that on officials.
"Which is exactly what any minister, anybody in public life should do when somebody comes forward with serious allegations."
Referring to Mr Nesbitt's resignation call, Mr Hamilton said: "I think that Mike, and some others, are more transfixed with the politics of this and are not concerned, don't give two hoots quite frankly, in terms of the implication on the public purse.
"That's what my focus is on, that's what Arlene's focus is on, not some of the stuntery that others will try to perform over the coming days."
Sinn FÃ©in MLA Conor Murphy said that it would be "helpful" for Mrs Foster, who is currently in China, to step forward and explain what happened to restore "public confidence".
Mr Murphy said his view came from his experience as a minister. In 2011, he was found to have discriminated against a man who applied to become head of NI Water.
"I speak from my own experience of the time when there was a crisis of confidence in how my own department was doing its business.
"I felt the best thing to do was step forward and answer the questions, difficult questions that they were at the time, but step forward and try to restore some public confidence."
He also said that he wanted to know what was "sent back up the chain to the minister (Mrs Foster)" after the whistleblower's claims had been investigated by the department.
Mrs Foster, now the first minister, has not commented on whether she made any effort to follow up on the whistleblower's claims.
She also pointed out that the permanent secretary of the economy department had said she acted "entirely appropriately".
But, she acknowledged that investigations into the claims "should have highlighted the failings of the scheme and actions should have been taken".
Arlene Foster "did not ignore" warnings by a whistleblower over an energy scheme that will cost NI taxpayers Â£400m, the economy minister has said.

Roberto Calderoli, from the anti-immigration Northern League, told a rally that the success of Integration Minister Cecile Kyenge encouraged "illegal immigrants" to come to Italy.
Ms Kyenge is an Italian citizen born in the Democratic Republic of Congo.
It is the latest in a series of rows over racism in Italy.
"I love animals - bears and wolves, as everyone knows - but when I see the pictures of Kyenge I cannot but think of, even if I'm not saying she is one, the features of an orangutan," Mr Calderoli said in a speech to a rally in the northern city of Treviso on Saturday.
He also said Ms Kyenge should be a minister "in her own country".
Mr Calderoli's words ignited a storm of criticism on social media and from political leaders.
Prime Minister Enrico Letta said the comments went "beyond all limits" and he offered "full solidarity and support to Cecile".
At first Mr Calderoli offered only a qualified apology, saying his words were part of a larger debate about immigration.
But by Sunday evening, he told the Italian news agency Ansa that he had called Ms Kyenge himself to apologise.
Ms Kyenge is a Congolese-born doctor who has lived in Italy since 1983.
The Northern League has expelled a local politician who suggested on Facebook that someone should rape Ms Kyenge so that she "can understand what victims of atrocious crimes feel".
And a Northern League member of the European Parliament was expelled from his party grouping after he said Ms Kyenge wanted to impose "tribal traditions" in Italy.
An Italian senator has been pressured into apologising after he said the country's first black cabinet minister reminded him of an orangutan.

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Following defeats by Ross County and Aberdeen in the space of four days, the Norwegian is adamant he has the support of the club's hierarchy.
Deila is also confident Celtic will retain the Premiership title.
"I don't consider it," he said of his position. "I talk with the players all the time, the board, we're in this together and we're going to turn it around together."
Despite Aberdeen's 2-1 victory at Pittodrie narrowing Celtic's lead at the top of the league to three points, Deila believes his team has the strength of character to win a fifth successive title.
He acknowledged that fans reacted angrily to the defeat, which came after Sunday's League Cup semi-final loss to County.
However, he maintains that Celtic are still in a strong position.
"I will never quit," he said. "This is a fantastic job and I see great opportunities here.
"The dream is to get into the Champions League and we have to win the league.
"There is a lot to play for and we will stick to what we believe in. There is a lot of quality in this team."
Aberdeen manager Derek McInnes still makes Celtic favourites to retain the title - and Deila agrees.
"We lost the game and now we're not in as good a situation as we could be, but the situation is positive, everything is still in our hands and there are a lot of games still to come," said the Norwegian.
"We are very eager and motivated to win the next game."
Deila said he could understand Celtic fans being upset by the consecutive defeats.
"They have big ambition as well for the club," he said. "They're disappointed, but the fans stood behind the team for the whole game.
"The important thing is everybody standing together, that we are one team, because everybody wants to beat Celtic.
"Of course I want to be loved, like everybody else, but I understand that people are irritated and want to have better results.
"To win the league is an absolute must. I believe that we can do this and we're going to fight for it this season."
Deila felt his players were "weak" in the County defeat, but he is backing his squad to cope with the closing stretch of the season.
"I never said mental weakness," he explained. "I said that we were not good enough in the two boxes, that's what we need to get better at.
"We'll deal with it, you have to deal with defeats.
"It's never happened before that we've lost two games in a row.
"Now we have to do everything to make sure it's not three. I feel very confident that we're going to turn it around."

Ronny Deila insists that he will never quit as Celtic manager.

