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:

• [x] Documentation
• [x] Tests
• [x] Ready to be merged
• [x] 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)	:arrow_up:
src/handle-glamorous-references.js	100% <100%> (ø)
src/looks-like.js	100% <100%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 7ea6289...c51415c. Read the comment docs.