Reduced verbosity of pytest error logs. Outputting logs to file.

Author: hcpchris

.travis.yml

@@ -31,6 +31,8 @@ install:
 before_script:
   - curl -Os --retry 5 https://uploader.codecov.io/latest/linux/codecov
   - chmod +x codecov
-script: tox -- -v -nauto
+script: tox -- -nauto > log_output.txt
+after_failure:
+  - tail -n 500 log_output.txt
 after_success:
   - if [[ -e .coverage ]]; then ./codecov -t $CODECOV_TOKEN; fi