Remove support for Python < 3.5

.travis.yml

@@ -8,10 +8,10 @@ addons:
       repo_token: 8582900c285e4da0f253555b1bac1ba501bd6ff07850b0f227166b3cdac59ecc
 
 python:
-  - "2.7"
-  - "3.4"
-  - "3.5"
-  - "3.6"
+  - 3.5
+  - 3.6
+  - 3.7
+  - 3.8
 
 install:
   - pip install --upgrade pip setuptools wheel
@@ -20,4 +20,4 @@ install:
   - pip install 'coverage>=4.0,<4.4' --force-reinstall # Upstream bug: https://bitbucket.org/ned/coveragepy/issues/578/incomplete-file-path-in-xml-report
   - pip install codeclimate-test-reporter
 
-script: python ./test.py && CODECLIMATE_REPO_TOKEN=8582900c285e4da0f253555b1bac1ba501bd6ff07850b0f227166b3cdac59ecc codeclimate-test-reporter
+script: python ./test.py && CODECLIMATE_REPO_TOKEN=8582900c285e4da0f253555b1bac1ba501bd6ff07850b0f227166b3cdac59ecc codeclimate-test-reporter