Gspread-formatting

-------------------
- Bump to version 0.3.0. [Robin Thomas]
- Include pypy and pypy3 in travis builds. [Robin Thomas]
- Add "batch updater" object (21) [Robin Thomas]

* Added batch capability to all formatting functions as well as format_with_dataframe.
Minimal test coverage.

* use "del listobj[:]" for 2.7 compatbility

* Additional batch-updater tests; added batch updater docs to README.

-------------------
- Bump to version 0.2.5. [Robin Thomas]
- Fixes 20: BooleanCondition objects returned by API endpoints may lack
a 'values' field instead of having a present 'values' field with an
empty list of values. Allow for this in BooleanCondition constructor.
Test coverage added for round-trip test of Boolean. [Robin Thomas]
- Argh no 3.9-dev yet. [Robin Thomas]
- Corrected version reference in sphinx docs. [Robin Thomas]
- Removed 3.6, added 3.9-dev to travis build` [Robin Thomas]
- Make collections.abc import 3.9-compatible. [Robin Thomas]
- Use full version string in sphnix docs. [Robin Thomas]
- Add docs badge to README. [Robin Thomas]
- Fix title in index.rst. [Robin Thomas]
- Try adding conditionals rst to docs. [Robin Thomas]
- Preserve original conditional rules for effective replacement of rules
in one API call. [Robin Thomas]
- Add downloads badge. [Robin Thomas]

-------------------
- Bump to v0.2.4. [Robin Thomas]
- Make new Color.fromHex() and toHex() 2.7-compatible. [Robin Thomas]

-------------------
- Bump to v0.2.3. [Robin Thomas]
- Color model import and export as hex color (17) [Sam Korn]

* Add toHex function to Color model

* tohex and fromhex functions for Color model

* Use classmethod for hexstring constructor

* tests for hex colors, additional checks for malformed hex inputs
- Results of check-manifest added to MANIFEST.in. [Robin Thomas]

-------------------
- Bump to v0.2.2. [Robin Thomas]
- Add MANIFEST.in to add VERSION file to sdist. [Robin Thomas]

-------------------
- Bump to v0.2.1. [Robin Thomas]
- Added support in DataFrame formatting for MultiIndex, either as index
or as the columns object of the DataFrame. [Robin Thomas]
- Added docs/ to start sphinx autodoc generation. [Robin Thomas]
- Add wheel dep for bdist_wheel support. [Robin Thomas]