feat(macro): add babel-plugin-macros compatible macro

[kentcdodds]

What: Create a macro for people to use in their projects

Why: It's a really handy tool!

How:

• Extracted core logic after finding references to a separate file
• Use that for the macro
• Add an import for glamorous

Checklist:

• Documentation
• Tests
• Ready to be merged
• Added myself to contributors table

[codecov-io]

Codecov Report

Merging #18 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #18   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      4    +3     
  Lines          64     72    +8     
  Branches       19     19           
=====================================
+ Hits           64     72    +8

Impacted Files	Coverage Δ
src/macro.js	100% <100%> (ø)
src/index.js	100% <100%> (ø)	⬆️
src/handle-glamorous-references.js	100% <100%> (ø)
src/looks-like.js	100% <100%> (ø)

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