update to final 1.31.0 release version.

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "microsoft-cognitiveservices-speech-sdk",
-  "version": "1.31.0-rc.2",
+  "version": "1.31.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "microsoft-cognitiveservices-speech-sdk",
-      "version": "1.31.0-rc.2",
+      "version": "1.31.0",
       "license": "MIT",
       "dependencies": {
         "agent-base": "^6.0.1",

package.json

@@ -2,7 +2,7 @@
   "name": "microsoft-cognitiveservices-speech-sdk",
   "author": "Microsoft Corporation",
   "homepage": "https://docs.microsoft.com/azure/cognitive-services/speech-service/",
-  "version": "1.31.0-rc.2",
+  "version": "1.31.0",
   "license": "MIT",
   "description": "Microsoft Cognitive Services Speech SDK for JavaScript",
   "keywords": [