Issue 58: Bump ruby version to 2.3.5

Closes codeforamerica#58. 2.3.5 is the latest version of ruby [supported by Heroku](https://devcenter.heroku.com/articles/ruby-support#supported-runtimes) and `json` 1.8.1. The current version is causing deploys of this app to Heroku to fail. I wasn't able to test the changes locally because of a [known issue](ruby/json#286) building json 1.8.3, a dependency of the "twitter" gem. I'm using the build process on Heroku and Travis as a barometer of "this works".
mshenfield · Sep 23, 2017 · 548e418 · 548e418
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commit 548e418
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diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 language: ruby
 rvm:
-  - ruby-2.1.2
+  - ruby-2.3.5
 notifications:
   webhooks: http://project-monitor.codeforamerica.org/projects/d702edae-5a33-478b-9d08-acc4a7826533/status
diff --git a/Gemfile b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-ruby '2.1.2'
+ruby '2.3.5'
 
 gem 'twitter'
 gem 'dotenv'