Travis CI not working

[esabol]

The latest dropbox-deployment gem requires a version of the faraday gem that only works on Ruby 2.4+.

Changing

    - rvm install 2.3.8

to

    - rvm install 2.4.5

in the .travis.yml file will get the checks working again with PRs.

However, in light of issue #157, maybe the dropbox-deployment stuff should all be commented out or removed?

[esabol]

The “Travis CI - Branch Expected — Waiting for status to be reported” message should be fixed by following the Remedy instructions found here:

https://travis-ci.community/t/known-issue-travis-ci-reports-expected-waiting-for-status-to-be-reported-on-the-github-status-api-but-the-status-never-arrives/1154

[esabol]

Ping @kinkofer

[kinkofer]

Removed Dropbox deployment in #168.