ci: Add swimm verify back to travis.yml

This reverts commit 4aa9a14f13.

.travis.yml

@@ -78,6 +78,14 @@ 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)