title: react.default.memo is not a function at createSvgIcon
body: <p>I've updated my Material-UI version to 1.0.0, but I'm having this strange error that </p>
  
  <pre><code>_react.default.memo is not a function
      at createSvgIcon
  </code></pre>
  
  <p>I've done a little research and they say to downgrade the react redux library to 6.0.0, so I've done this but the error persists. The dependencies are these:</p>
  
  <pre><code>"dependencies": {
      "@material-ui/codemod": "^4.5.0",
      "@material-ui/core": "^1.0.0",
      "@material-ui/icons": "^4.5.1",
      "@material-ui/styles": "^4.7.1",
      "babel-polyfill": "~6.22.0",
      "browser-filesaver": "~1.1.1",
      "build-url": "~1.2.0",
      "es6-promise": "~4.2.5",
      "file-saver": "~2.0.1",
      "iban": "~0.0.8",
      "immutable": "~3.8.2",
      "jsdoc": "^3.6.3",
      "jsdoc-api": "~3.0.0",
      "loaders.css": "~0.1.2",
      "material-ui": "^0.20.2",
      "moment": "~2.20.1",
      "prop-types": "~15.6.0",
      "react": "~16.3.0",
      "react-datepicker": "~0.48.0",
      "react-dom": "~16.2.0",
      "react-feature-toggles": "~3.0.3",
      "react-intl": "~2.4.0",
      "react-loaders": "~3.0.1",
      "react-redux": "~6.0.0",
      "react-router": "~3.2.0",
      "react-tooltip": "~3.10.0",
      "redux": "~3.7.2",
      "redux-form": "~6.8.0",
      "redux-form-material-ui": "~4.3.3",
      "redux-immutable": "~4.0.0",
      "redux-persist": "~4.8.0",
      "redux-persist-immutable": "~4.3.1",
      "redux-saga": "~0.15.3",
      "whatwg-fetch": "~2.0.1"
    },
    "devDependencies": {
      "babel-core": "~6.26.0",
      "babel-eslint": "~7.1.1",
      "babel-loader": "~7.1.2",
      "babel-plugin-istanbul": "~3.1.2",
      "babel-plugin-transform-object-rest-spread": "~6.26.0",
      "babel-plugin-transform-runtime": "~6.23.0",
      "babel-preset-es2015": "~6.22.0",
      "babel-preset-react": "~6.22.0",
      "chai": "~3.5.0",
      "cross-env": "~6.0.3",
      "css-loader": "~0.26.0",
      "enzyme": "~3.6.0",
      "enzyme-adapter-react-16": "~1.5.0",
      "enzyme-react-intl": "~1.4.5",
      "enzyme-redux": "~0.1.8",
      "eslint": "~3.19.0",
      "eslint-config-airbnb": "~14.1.0",
      "eslint-loader": "~1.6.1",
      "eslint-plugin-import": "~2.2.0",
      "eslint-plugin-jsx-a11y": "~4.0.0",
      "eslint-plugin-react": "~6.9.0",
      "exports-loader": "~0.6.3",
      "file-loader": "~0.10.1",
      "html-loader": "~0.4.4",
      "html-webpack-plugin": "~2.28.0",
      "ignore-styles": "~5.0.1",
      "imports-loader": "~0.7.0",
      "istanbul": "~0.4.5",
      "jsdom": "~9.8.3",
      "jsdom-global": "~2.1.0",
      "json-loader": "~0.5.4",
      "mocha": "~5.0.1",
      "node-sass": "~4.13.0",
      "nyc": "~14.1.1",
      "react-test-renderer": "~16.5.2",
      "redux-saga-testing": "~1.0.5",
      "redux-test-utils": "~0.1.3",
      "sass-loader": "~4.1.1",
      "sinon": "~2.2.0",
      "style-loader": "~0.13.1",
      "webpack": "~3.10.0",
      "webpack-dev-server": "~2.11.1"
    },
  </code></pre>
  
  <p>Do you know why this error occurs?</p>