Bump to 2.2.2

[connorworley]

Includes #172

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@7668385). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #179   +/-   ##
=========================================
  Coverage          ?   50.80%           
=========================================
  Files             ?       37           
  Lines             ?     8320           
  Branches          ?     1770           
=========================================
  Hits              ?     4227           
  Misses            ?     3780           
  Partials          ?      313           

Flag	Coverage Δ
#unit	50.80% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
stone/cli_helpers.py	85.34% <0.00%> (ø)
stone/backends/python_rsrc/stone_validators.py	87.77% <0.00%> (ø)
stone/backends/python_client.py	35.71% <0.00%> (ø)
stone/backends/obj_c.py	0.00% <0.00%> (ø)
stone/backends/tsd_helpers.py	48.68% <0.00%> (ø)
stone/backends/swift_types.py	0.00% <0.00%> (ø)
stone/typing_hacks.py	60.00% <0.00%> (ø)
stone/backends/swift_client.py	0.00% <0.00%> (ø)
stone/backends/js_types.py	0.00% <0.00%> (ø)
stone/backends/tsd_client.py	59.67% <0.00%> (ø)
... and 27 more

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[connorworley]

Also includes #178 #180 #181.