Update u.json

src/technologies/u.json

@@ -195,12 +195,12 @@
     "website": "http://ultracart.com"
   },
   "utterances": {
-    "description":"Utterances is a lightweight comments widget built on GitHub issues",
+    "description":"Utterances is a lightweight comments widget built on GitHub issues.",
     "cats": [
       15
     ],
     "dom": "iframe[src*='utteranc.es/client.js']",
-    "xhr": "\.utteranc\.es",
+    "xhr": "\\.utteranc\\.es",
     "icon": "utterances.png",
     "oss": true,
     "website": "https://github.com/utterance/utterances"