Bump versions to 2.11.0 pre-release

Author: pabloFuente

front/openvidu-call/package.json

@@ -19,7 +19,7 @@
     "fs-extra": "8.1.0",
     "jquery": "3.4.1",
     "ngx-linkifyjs": "1.3.0",
-    "openvidu-browser": "2.12.0",
+    "openvidu-browser": "2.11.0",
     "rxjs": "6.5.4",
     "tslib": "1.11.1",
     "wolfy87-eventemitter": "5.2.9",
@@ -64,5 +64,5 @@
     "start": "ng serve",
     "test": "ng test"
   },
-  "version": "2.12.0"
+  "version": "2.11.0"
 }