call double ratchet what it is

javascript/package.json

 {
   "name": "olm",
   "version": "1.2.0",
-  "description": "An implementation of a well known cryptographic ratchet",
+  "description": "An implementation of the Double Ratchet cryptographic ratchet",
   "main": "olm.js",
   "files": [
     "olm.js",