Added support for Semaphore 2.0

[Helveg]

This pull request aims to differentiate between Semaphore Classic and the new Semaphore 2.0. It uses the different env vars to detect the difference, specifically the SEMAPHORE_REPO_SLUG was used because its name should have a low prevalence outside of this context, and its counterpart in 2.0 SEMAPHORE_GIT_REPO_SLUG is very similar.

I'm unsure what the 'service' field is for and whether it needs to be recognized by codecov server side so I left it on semaphore

[codecov[bot]]

Codecov Report

Merging #220 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #220   +/-   ##
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  Coverage       0%     0%           
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  Files           1      1           
  Lines           1      1           
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  Misses          1      1

[thomasrockhu-codecov]

Closing due to deprecation