Implemented alias discover for require

[AlexMost]

Issue - ttag-org/ttag#120

This syntax is ok for aliasing gettext to i18n:

const { gettext: i18n } = require('ttag')
i18n`test`;

[codecov]

Codecov Report

Merging #112 into master will decrease coverage by 0.19%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #112     +/-   ##
=========================================
- Coverage   96.97%   96.78%   -0.2%     
=========================================
  Files          14       14             
  Lines        1225     1243     +18     
  Branches      191      195      +4     
=========================================
+ Hits         1188     1203     +15     
- Misses         37       40      +3

Impacted Files	Coverage Δ
src/plugin.js	97.89% <100%> (-1.53%)	⬇️

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