Gspread-formatting

-------------------
- Bump to v1.0.5. [Robin Thomas]
- Fixes 38. Avoids import errors, and also adapts test code to avoid
that Spreadsheet.__init__ calls fetch_sheet_metadata, working with new

-------------------
- Bump to v1.0.4. [Robin Thomas]
- Fixes 35. Allows for bare RelativeDate objects in the values list to
BooleanCondition, transforming to ConditionValue objects with
relativeDate. [Robin Thomas]

-------------------
- Bump to v1.0.3. [Robin Thomas]
- Fixes 34. Cells with no formatting or data validation rules were
causing KeyError exceptions in get_effective_format() and similar
functions. These functions now properly return None without raising an
exception. [Robin Thomas]

-------------------
- Bump to v1.0.2. [Robin Thomas]
- Compare model classes to json schema from discovery URI, using new
script; remove foregroundColorStyle from CellFormat class as it's not
in json schema. (Border.width is in json schema but is deprecated and
thus Border model class is correctly coded.) [Robin Thomas]

-------------------
- Bump to v1.0.1. [Robin Thomas]
- Fixes 33 -- 'link' property of TextFormat now supported. [Robin
Thomas]

-------------------
- Bump to v1.0.0. [Robin Thomas]
- Fix for 31 (32) [Robin Thomas]

Fixes 31. Allows for Sheets API's tendency to include empty objects
for default color values in API responses.
- No longer CI with pypy. [Robin Thomas]
- Revert "Attempt to constrain use of old rsa pkg to 2.7 CI build, and
also" [Robin Thomas]

This reverts commit 5cc83c67036ba5d004de997b613a34e9a8550f24.
- Revert "Attempt to constrain use of old rsa pkg to 2.7 CI build, and
also" [Robin Thomas]

This reverts commit 5cc83c67036ba5d004de997b613a34e9a8550f24.
- Revert "Try TravisCI conditional use of rsa<=4.1 again" [Robin Thomas]

This reverts commit b8ecaad65f0876385a1585237d756ee1fd450fb0.
- Oops use rsa<4.1. [Robin Thomas]
- Try TravisCI conditional use of rsa<=4.1 again. [Robin Thomas]
- Attempt to constrain use of old rsa pkg to 2.7 CI build, and also
avoid the github dependabot alert. [Robin Thomas]
- Pin rsa to < 4.1 so that Python 2.7 CI can still run. [Robin Thomas]
- Added paranoid test of absent sheetId in GridRange props, to prevent
accidental regression. [Robin Thomas]
- Improved, more concise code for Color.fromHex and .toHex(). [Robin
Thomas]
- Tighten up travis install. [Robin Thomas]
- Try explicit directory caching to make pip cache work as expected for
pandas wheel. [Robin Thomas]
- Add 3.9 to travis. [Robin Thomas]
- Pin six to >=1.12.0 in travis to avoid weird environmental dependency
problem. [Robin Thomas]
- Move to travis-ci.com. [Robin Thomas]