Have pip summarize what's installed before running the tests.

ceball · ceball · commit bb62571b0a28 · 2020-06-11T14:32:19.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -27,6 +27,7 @@ install:
     fi
   - pip install doit
   - doit install_test_deps
+  - pip freeze
 
 # command to run tests
 script: doit test
