tweak bash boolean check

Author: mattsb42-aws

.travis.yml

@@ -72,6 +72,6 @@ matrix:
 install:
     # Clean up because Travis doesn't
     # https://github.com/travis-ci/travis-ci/issues/7940
-    - if [[ $TRAVIS_SUDO = true ]]; then sudo rm -f /etc/boto.cfg;done
+    - if [[ $TRAVIS_SUDO ]]; then sudo rm -f /etc/boto.cfg;done
     - pip install tox
 script: travis_wait 60 tox -- -vv