* develop:
  If it is a windows machine, check if terminal is latest version that supports emojis (#1490)
  Remove Python 2 check in 'hello' df demo (#1486)
  Update README (#1493)
  Fix broken link by removing unnecessary 'd' (#1492)
  Update doc references for RTD (#1485)
  Remove excess parenthesis from selectbox example (#1488)
  Upgrade patch versions (#1463)
  Update date_input to accept a range for a ranged datepicker (#1483)
  radio docstring consistency in format_func param (#1480)
  Hash func for Tensorflow saved model (#1468)
  Figure out which env we are in for RTD (#1473)
  Version 0.60.0 (#1460)
  Remove extra start_time parameter (#1470)
  Fix spelling mistake in hello demo (#1469)

* feature/plugins: (26 commits)
  revert accidentally-committed datframe serialization breakage
  Example PyPI package (streamlit#1462)
  If it is a windows machine, check if terminal is latest version that supports emojis (streamlit#1490)
  Remove Python 2 check in 'hello' df demo (streamlit#1486)
  Update README (streamlit#1493)
  Fix broken link by removing unnecessary 'd' (streamlit#1492)
  Update doc references for RTD (streamlit#1485)
  Remove excess parenthesis from selectbox example (streamlit#1488)
  Upgrade patch versions (streamlit#1463)
  Update date_input to accept a range for a ranged datepicker (streamlit#1483)
  radio docstring consistency in format_func param (streamlit#1480)
  Hash func for Tensorflow saved model (streamlit#1468)
  Figure out which env we are in for RTD (streamlit#1473)
  Fix component examples
  Version 0.60.0 (streamlit#1460)
  Remove extra start_time parameter (streamlit#1470)
  Fix spelling mistake in hello demo (streamlit#1469)
  Keras model hash func (streamlit#1450)
  Add support for st.echo("below") to print echoed text below the Streamlit output (streamlit#1452)
  Update 3.5 references to 3.6 (streamlit#1444)
  ...