Codecov reports are incorrect
### Summary
Tarpaulin test coverage generates correct results at ~86-88% code coverage.
Codecov reports only the coverage from `src/{coin}/network` and `src/{coin}/wordlist`.

### Steps to reproduce
1. Commit and push to a branch, and wait for Travis CI to complete on `stable` branch
2. See Tarpaulin coverage results at the bottom of the CI output
3. See Codecov report from the upload link found in the bottom of the CI output