Trying a different config. Now we try executing a gem install in the before_install part of our python based language block.

.travis.yml

@@ -1,19 +1,12 @@
-matrix:
+language: python
-  include:
+python:
-    - language: ruby
-      rvm:
-        - 2.2
-        - jruby
-        - 2.0.0-p247
-      install: gem install zsteg
-
-    - language: python
-      python:
   - 3.6
-      install:
+before_install:
+  - gem install zsteg
+install:
   - pip install -r requirements.txt
-      script:
+script:
   - pytest --junitxml=result.xml
   - python badge.py
-      after_success:
+after_success:
   - coveralls