Pull the most recently updated PRs

[kyeah]

Closes #165.

This sorts by updated_at when retrieving PRs and short-circuits if it passes the oldest release range date.

[codecov-io]

Codecov Report

Merging #166 into master will decrease coverage by 45.79%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #166      +/-   ##
==========================================
- Coverage   84.05%   38.26%   -45.8%     
==========================================
  Files           7        7              
  Lines         345      345              
==========================================
- Hits          290      132     -158     
- Misses         55      213     +158

Impacted Files	Coverage Δ
lib/src/Gren.js	5.28% <0%> (-75.49%)	⬇️
lib/src/GitHubInfo.js	80.95% <0%> (-4.77%)	⬇️

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[alexcanessa]

Nice 👍