Badges and codecov

[BartBucknill]

Added travis build badge to README; changed npm test scipt in package.json to run coverage, tape, tap-spec for multiple test files; added codecov to .travis.yml.

Still to do:

• [x] make sure that codecov report is being generated and shown on PR.
• [x] put codecov badge into README (@Jen-Harris may need to do this, see Dwyl tutorial and search for 'Add a badge' for how to. Also refer travis build badge in readme (its a markdown image and link).)

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@1542e7c). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #40   +/-   ##
=========================================
  Coverage          ?   71.73%           
=========================================
  Files             ?        2           
  Lines             ?       46           
  Branches          ?        0           
=========================================
  Hits              ?       33           
  Misses            ?       13           
  Partials          ?        0

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[BartBucknill]

That seems to have worked. The error showing is just because master has no codecov report for comparison. Once this is merged into master any future PRs should have this.