Add release-drafter action

[ctreffs]

Add https://github.com/release-drafter/release-drafter action to simplify release process

[codecov[bot]]

Codecov Report

Merging #40 (969438c) into master (5f71f64) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #40   +/-   ##
=======================================
  Coverage   98.09%   98.09%           
=======================================
  Files          30       30           
  Lines        1368     1368           
=======================================
  Hits         1342     1342           
  Misses         26       26