Re-enable e2e zeppelin & metacoin

[cgewecke]

Runs

• sc-forks/openzeppelin-contracts#provider-benchmarks (Static fork)
• metacoin w/ solidity test

[codecov-io]

Codecov Report

Merging #396 into truffle-plugin will decrease coverage by 1.93%.
The diff coverage is 40%.

@@                Coverage Diff                @@
##           truffle-plugin    #396      +/-   ##
=================================================
- Coverage           94.44%   92.5%   -1.94%     
=================================================
  Files                  10      10              
  Lines                 522     534      +12     
=================================================
+ Hits                  493     494       +1     
- Misses                 29      40      +11

Impacted Files	Coverage Δ
lib/ui.js	80% <0%> (-20%)	⬇️
lib/app.js	91.09% <100%> (ø)	⬆️
dist/truffle.plugin.js	84.5% <37.5%> (-12.22%)	⬇️

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