fix(git-tag-name): npm5 has issues with git tags with @ and / chars

[ramasilveyra]

npm5 has issues with git tags with @ and / chars.

NOTE: this doesn't happen with npm 3

[codecov-io]

Codecov Report

Merging #1 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master       #1   +/-   ##
=======================================
  Coverage   54.76%   54.76%           
=======================================
  Files          17       17           
  Lines         126      126           
  Branches       16       16           
=======================================
  Hits           69       69           
  Misses         55       55           
  Partials        2        2

Impacted Files	Coverage Δ
src/tasks/Publish/normalise-package-name.js	100% <ø> (ø)	⬆️
src/tasks/Publish/get-git-tag-name.js	100% <100%> (ø)	⬆️

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