release: v1.6.0

[weibullguy]

This PR tracks the release of v1.6.0. All bugs found in one of the release candidates for v1.6.0 will be addressed on this branch.

Closes #124
Closes #150
Closes #157
Closes #159
Closes #160

[coveralls]

Pull Request Test Coverage Report for Build 3999962315

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

---

Totals
Change from base Build 3980933255:	0.0%
Covered Lines:	0
Relevant Lines:	0

---

💛 - Coveralls

[weibullguy]

For the curious until I get Coveralls working:

Name                                Stmts   Miss Branch BrPart  Cover   Missing
-------------------------------------------------------------------------------
src/docformatter/__init__.py            2      0      0      0   100%
src/docformatter/__main__.py           15      1      6      1    90%   82
src/docformatter/__pkginfo__.py         2      0      0      0   100%
src/docformatter/configuration.py      82      2     38      4    95%   37-38, 82->87, 83->82, 275->279, 296->exit
src/docformatter/encode.py             29      1     10      0    97%   68
src/docformatter/format.py            153      5     68      2    97%   134-135, 140, 240-241
src/docformatter/strings.py            66      0     32      0   100%
src/docformatter/syntax.py             90      2     46      3    96%   240, 322, 458->exit
src/docformatter/util.py               28      0     24      0   100%
-------------------------------------------------------------------------------
TOTAL                                 467     11    224     10    97%