Lock swagger-client dependency version

package.json

@@ -69,7 +69,7 @@
     "reselect": "2.5.3",
     "serialize-error": "2.0.0",
     "shallowequal": "0.2.2",
-    "swagger-client": "~3.0.12",
+    "swagger-client": "3.0.12",
     "url-parse": "^1.1.8",
     "whatwg-fetch": "0.11.1",
     "worker-loader": "^0.7.1",