Merge pull request #7 from colde/master

Make sure exit works to quit the virtualenv shell

conf.d/pipenv.fish

@@ -14,7 +14,7 @@ if command -s pipenv > /dev/null
 
         if not test -n "$PIPENV_ACTIVE"
           if sh -c 'pipenv --venv >/dev/null 2>&1'
-            exec pipenv shell
+            pipenv shell
           end
         end
     end