title: How to give chart title to a chart in Python-pptx chart in Chart Area(Not the slide title)
body: <p>I am trying to add text to chart title in chart area in a PPT Slide(Not the slide title).I have <a href="http://python-pptx.readthedocs.io/en/latest/dev/analysis/cht-chart-title.html" rel="noreferrer">http://python-pptx.readthedocs.io/en/latest/dev/analysis/cht-chart-title.html</a> this link if any text can be added to my chart but I couldn't find the solution.Here is my,</p>
  
  <pre><code>import numpy as np
  import pandas as pd
  import pyodbc
  #import pptx as ppt 
  import matplotlib.pyplot as plt
  from pptx import Presentation
  from pptx.chart.data import ChartData
  from pptx.chart.data import XyChartData
  from pptx.enum.chart import XL_CHART_TYPE
  from pptx.util import Inches,Pt
  from pptx.enum.chart import XL_LABEL_POSITION
  from pptx.dml.color import RGBColor
  from pptx.dml import fill
  from pptx.chart.chart import ChartTitle
  from pptx.chart.chart import Chart
  
  
  
  cnxn = pyodbc.connect("Driver={SQL Server Native Client 11.0};"
                          "Server=SNAME;"
                          "Database=DNAME;"
                          "Trusted_Connection=yes;")
  AvgResponseTimequery = 'EXEC [SLA].[MONTHWISEREPORT]'
  df=pd.read_sql(sql=AvgResponseTimequery,con=cnxn)
  #df
  
  
  
  
  getprs = Presentation('D:\SLA Pyth\hubiC-06-20-2017 1_10_55\SLAPerformance.pptx')
  slide = getprs.slides.add_slide(getprs.slide_layouts[5])
  slide.shapes.title.text = 'Key Performance KPIs'
  
  chart_data = ChartData()
  chart_data.categories = df['Month'].values.tolist()
  chart_data.add_series('Average Report Response time(Seconds)', tuple(df['Avg Response Time']))
  x, y, cx, cy = Inches(0.5), Inches(2), Inches(9), Inches(3)
  
  chart=slide.shapes.add_chart(
      XL_CHART_TYPE.COLUMN_CLUSTERED, x, y, cx, cy, chart_data
  ).chart
  
  #chart.has_title = True
  #Chart.chart_title = "Response Time in Seconds"  #Tried to add text here, I didnt get any error though
  #ChartTitle.has_text_frame = True
  
  
  chart.has_title = True
  chart.chart_title = "Response Time in Seconds"
  # Check the has_text_frame property of this chart's chart_title:
  print(chart.has_text_frame)
  
  
  
  plot = chart.plots[0]
  plot.has_data_labels = True
  data_labels = plot.data_labels
  
  chart.series[0].format.fill.solid()
  chart.series[0].format.fill.fore_color.rgb = RGBColor(46, 125, 137)
  
  getprs.save('D:\SLA REPORT MONTH WISE\SALReport1.pptx')
  </code></pre>