adds codecov; closes #230

[cglewis]

Fixes #230

Checklist

• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the [Contribution Guide] and my PR follows them.
• I updated my branch with the master branch.
• I have added tests that prove my fix is effective or that my feature works
• N/A I have added necessary documentation about the functionality in the appropriate .md file
• N/A I have added in line documentation to the code I modified

Short description of what this PR does:

• adds codecov to testing with travis

If you have questions, please send an email to Sendgrid, or file a Github Issue in this repository.

[SendGridDX]

All committers have signed the CLA.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@ece97af). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #231   +/-   ##
=========================================
  Coverage          ?   70.94%           
=========================================
  Files             ?        3           
  Lines             ?      413           
  Branches          ?        0           
=========================================
  Hits              ?      293           
  Misses            ?      118           
  Partials          ?        2

---

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[cglewis]

the check that failed is because there was no report found to compare against, but since this is the first one, it's not actually an issue.

[thinkingserious]

Hello @cglewis,

Thanks again for the PR!

We appreciate your contribution and look forward to continued collaboration. Thanks!

Team SendGrid DX

[mbernier]

@cglewis

If you are interested, we would love the opportunity to talk to you about Hacktoberfest and our API libraries.

Our agenda would be: Explore what you liked and is there anything we can do to improve?

You can grab a time on my calendar that works for you and we can have a chat on Google Hangout or Skype. If you prefer, you can email me using my GitHub username at my company’s domain.

Thank you so much,

Matt Bernier - @mbernier - SendGrid Developer Experience Product Manager
Elmer Thomas - @thinkingserious - SendGrid Developer Experience Engineer
@sendgrid