Keep releases lean

[raphaelstolt]

Excludes unnecessary files from releases/distributions. The LICENSE.md file might be excluded from that list of files, but that's up to your liking.

Is the churn.ymlruntime relevant or is it just an example? If so it prolly should be moved into a dedicated resources or example directory.

[codecov]

Codecov Report

Merging #142 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #142   +/-   ##
=========================================
  Coverage     67.76%   67.76%           
  Complexity      105      105           
=========================================
  Files            11       11           
  Lines           363      363           
=========================================
  Hits            246      246           
  Misses          117      117

---

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 b122745...9525102. Read the comment docs.

[bmitch]

Thanks @raphaelstolt

churn.yml can be removed. I'll go ahead and do that.