chore: add Ruby 2.7 to Travis (#116)

Author: childish-sambino

.travis.yml

@@ -1,26 +1,27 @@
 env:
   global:
-  - CC_TEST_REPORTER_ID=$CC_TEST_REPORTER_ID
+    - CC_TEST_REPORTER_ID=$CC_TEST_REPORTER_ID
 language: ruby
 rvm:
-- ruby-head
-- 2.6
-- 2.5
-- 2.4
-- jruby
+  - ruby-head
+  - 2.7
+  - 2.6
+  - 2.5
+  - 2.4
+  - jruby
 before_install:
 - gem install minitest
 - gem install simplecov
 - gem install codecov
 before_script:
-- curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64
-  > ./cc-test-reporter
-- chmod +x ./cc-test-reporter
-- "./cc-test-reporter before-build"
+  - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64
+    > ./cc-test-reporter
+  - chmod +x ./cc-test-reporter
+  - "./cc-test-reporter before-build"
 script:
-- rake
+  - rake
 after_script:
-- "./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT"
+  - "./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT"
 deploy:
   provider: rubygems
   api_key:

README.md

@@ -12,7 +12,6 @@
 If you are looking for the SendGrid API client library, please see [this repo](https://github.com/sendgrid/sendgrid-ruby).
 
 # Announcements
-**NEW:** If you're a software engineer who is passionate about #DeveloperExperience and/or #OpenSource, [this is an incredible opportunity to join our #DX team](https://sendgrid.com/careers/role/1421152/?gh_jid=1421152) as a Developer Experience Engineer and work with [@thinkingserious](https://github.com/thinkingserious) and [@aroach](https://github.com/aroach)! Tell your friends :)
 
 All updates to this library are documented in our [CHANGELOG](https://github.com/sendgrid/ruby-http-client/blob/master/CHANGELOG.md).
 
@@ -30,7 +29,7 @@ All updates to this library are documented in our [CHANGELOG](https://github.com
 
 ## Prerequisites
 
-- Ruby version 2.2+
+- Ruby version >= 2.4
 
 ## Setup Environment Variables