Make /deps.json/<revspec> route accept slashes

As noted on aspiers#75, currently, the server doesn't recognize requests for /deps.json/ route for branch names with slashes (i.e. `feat/` and `fix/`). The fix is done by adding a `path:` converter to the route, as explained in http://flask.pocoo.org/docs/1.0/quickstart/#variable-rules.

Closes aspiers#75

git_deps/server.py

@@ -74,7 +74,7 @@ def send_options():
         client_options['repo_path'] = os.getcwd()
         return jsonify(client_options)
 
-    @webserver.route('/deps.json/<revspec>')
+    @webserver.route('/deps.json/<path:revspec>')
     def deps(revspec):
         detector = DependencyDetector(options)
         listener = JSONDependencyListener(options)