ci: remove `swimm verify` for now

There is a bug in swimm that is causing `swimm verify` to fail in the CI
pipeline, eventhough it succeeds locally. Disabling for now while the
swimm team works to rectify the issue.

.travis.yml

@@ -86,14 +86,6 @@ script:
 - cd $TRAVIS_BUILD_DIR/docs
 - hugo --verbose --environment staging
 
-# verify swimm
-- cd $TRAVIS_BUILD_DIR
-- wget "https://firebasestorage.googleapis.com/v0/b/swimmio.appspot.com/o/Release%2Fv029%2FSwimm_0.2.9_Setup.deb?alt=media&token=774ebd98-cb4e-4615-900c-aada224c1608" -O swimm
-- sudo dpkg -i swimm || (sudo apt-get update && sudo apt-get -f install)
-- chmod +x ./swimm
-- swimm --version
-- swimm verify
-
 after_success:
   # Upload code coverage results to codecov.io, see https://github.com/codecov/codecov-bash for more information
   - bash <(curl -s https://codecov.io/bash)