Use codecov bash uploader

[shazron]

This works in Travis CI windows because the build is run under git-bash.

How Has This Been Tested?

that's the purpose of this PR :)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@df8ca18). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             master      #249   +/-   ##
==========================================
  Coverage          ?   100.00%           
==========================================
  Files             ?        21           
  Lines             ?       766           
  Branches          ?       104           
==========================================
  Hits              ?       766           
  Misses            ?         0           
  Partials          ?         0           

Impacted Files	Coverage Δ
src/commands/app/add/web-assets.js	100.00% <0.00%> (ø)
src/commands/app/create.js	100.00% <0.00%> (ø)
src/commands/app/delete/action.js	100.00% <0.00%> (ø)
src/commands/app/init.js	100.00% <0.00%> (ø)
src/lib/import.js	100.00% <0.00%> (ø)
src/commands/app/add/ci.js	100.00% <0.00%> (ø)
src/commands/app/deploy.js	100.00% <0.00%> (ø)
src/commands/app/use.js	100.00% <0.00%> (ø)
src/commands/app/undeploy.js	100.00% <0.00%> (ø)
src/commands/app/delete/ci.js	100.00% <0.00%> (ø)
... and 11 more

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