don't skip Pipenv installation if there are git deps (#656)

bin/steps/pipenv

@@ -9,15 +9,18 @@ set -e
 if [[ -f Pipfile.lock ]]; then
     if [[ -f .heroku/python/Pipfile.lock.sha256 ]]; then
         if [[ $(openssl dgst -sha256 Pipfile.lock) == $(cat .heroku/python/Pipfile.lock.sha256) ]]; then
-            if [[ ! "$PIPENV_ALWAYS_INSTALL" ]]; then
+            # Measure that we're using Pipenv.
+            mcount "tool.pipenv"
+
+            # Don't skip installation of there are git deps.
+            if ! grep -q 'git' Pipfile.lock; then
                 echo "Skipping installation, as Pipfile.lock hasn't changed since last deploy." | indent
-                # echo "To disable this functionality, run the following command:"
-                # echo ""
-                # echo "    $ heroku config:set PIPENV_ALWAYS_INSTALL=1" | indent
+
                 mcount "tool.pipenv"
                 export SKIP_PIPENV_INSTALL=1
                 export SKIP_PIP_INSTALL=1
             fi
+
         fi
     fi
 fi