bum version and rebuild

package.json

@@ -1,7 +1,7 @@
 {
   "name": "tinode-webapp",
   "description": "Tinode messenger for the web",
-  "version": "0.15.11",
+  "version": "0.15.12-rc1",
   "devDependencies": {
     "@babel/core": "^7.1.2",
     "@babel/preset-env": "^7.1.0",

src/version.js

@@ -1,3 +1,3 @@
 // This is a generated file. Don't edit.
 
-export const PACKAGE_VERSION = "0.15.11";
+export const PACKAGE_VERSION = "0.15.12-rc1";

umd/index.dev.js

@@ -809,7 +809,7 @@ module.exports = {"en":{"contacts_not_found":"You have no chats<br />¯∖_(ツ)
 "use strict";
 __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "PACKAGE_VERSION", function() { return PACKAGE_VERSION; });
-var PACKAGE_VERSION = "0.15.11";
+var PACKAGE_VERSION = "0.15.12-rc1";
 
 /***/ }),