Loosen upper bounds on Colors

[timholy]

Once this merges, a new release would be nice.

[coveralls]

Coverage decreased (-0.2%) to 91.898% when pulling 6767ede on teh/colors_compat into 6114ec4 on master.

[coveralls]

Coverage decreased (-0.1%) to 92.014% when pulling 6767ede on teh/colors_compat into 6114ec4 on master.

[codecov]

Codecov Report

Merging #314 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #314   +/-   ##
=======================================
  Coverage   92.12%   92.12%           
=======================================
  Files           1        1           
  Lines         432      432           
=======================================
  Hits          398      398           
  Misses         34       34

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