Fix olm library reference.

package.json

@@ -1,14 +1,14 @@
 {
   "name": "node-red-contrib-matrix-chat",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "description": "Matrix chat server client for Node-RED",
   "dependencies": {
-    "@matrix-org/olm": "^3.2.8",
     "fs-extra": "^9.1.0",
     "got": "^11.8.2",
     "isomorphic-webcrypto": "^2.3.8",
     "matrix-js-sdk": "^15.3.0",
     "node-localstorage": "^2.2.1",
+    "olm": "https://packages.matrix.org/npm/olm/olm-3.2.1.tgz",
     "process": "^0.11.10",
     "utf8": "^3.0.0"
   },