Fix global variable declarations in formatters.pyi

[mwchase]

Convert aliases into type annotations, as was intended.

This needs some work to prove it out, since apparently mypy isn't cross-checking the py and pyi files, or it would have caught this?

[codecov]

Codecov Report

Merging #230 (e44d033) into master (08417d6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #230   +/-   ##
=======================================
  Coverage   95.36%   95.36%           
=======================================
  Files           9        9           
  Lines        1014     1014           
  Branches      163      176   +13     
=======================================
  Hits          967      967           
  Misses         43       43           
  Partials        4        4           

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[avylove]

Looks like you fixed a legitimate bug. Pylint failures are unrelated and already fixed. Thanks for your help with that.