Enhancements:
-------------

* refactor indexing to cache more efficiently  #3091
* add ``tags``, ``identifiers``, and ``keywords`` to about section.  Tie them into channeldata.json.  #3091
* filter .la files from packages by default  #3102
* memoize read_meta_file  #3108

Bug fixes:
----------

* fix --check for optionally iterable fields  #3098
* fix permission problems prior to fixing shebangs  #3101
* do not disable pip's cache directory.  Redirect it instead.  #3104
* fix usage of config in load_setup_py_data  #3110
* show logger message when default numpy is used, to communicate what's happening to the user  #3110

Other:
------

* drop python 3.4, add 3.6, 3.7 to skeleton pypi  #3103

Contributors:
-------------

* @jjhelmus
* @kalefranz
* @msarahan
* @nehaljwani
* @nsoranzo
* @ocefpaf
* @teake