remove the --deployment flag

this … apparently changes where the gems are installed? My understanding
from the docs is that --deployment installs the gems into the project
folder, inside vendor/, but removing that flag seems to have allowed
fastlane to run again … so idk. Anyway.

Author: hawkrives

scripts/travis/install.sh

@@ -15,4 +15,4 @@ if [[ $TRAVIS_OS_NAME == "osx" ]]; then
 fi
 
 # install fastlane
-bundle install --deployment
+bundle install