try to use minimal language environment
-# We set the language to c because python isn't supported on the MacOS X nodes
-# on Travis. However, the language ends up being irrelevant anyway, since we
-# install Python ourselves using conda.
-language: c
+# We set the language to minimal because the language ends up being
+# irrelevant anyway, since we install Python ourselves using conda.
+language: minimal
os:
- linux
