fix(gateway): prevent duplication of @ in version links

[trieloff]

fixes #184

[github-actions]

This PR will trigger a patch release when merged.

[codecov]

Codecov Report

Merging #188 (83d8857) into main (0bf3f17) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #188   +/-   ##
=======================================
  Coverage   84.13%   84.13%           
=======================================
  Files          19       19           
  Lines        1267     1267           
=======================================
  Hits         1066     1066           
  Misses        201      201           

Impacted Files	Coverage Δ
src/gateway/FastlyGateway.js	100.00% <100.00%> (ø)

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[github-actions]

🎉 This PR is included in version 3.16.3 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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