#143 add curl dep to validate and deploy files

[martinjrobins]

Fixes #143

[codecov]

Codecov Report

Merging #144 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #144   +/-   ##
=======================================
  Coverage   87.85%   87.85%           
=======================================
  Files          48       48           
  Lines        2199     2199           
=======================================
  Hits         1932     1932           
  Misses        267      267           

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