sdk fix for attachment rendering in previews, bumped version

package.json

@@ -1,7 +1,7 @@
 {
   "name": "tinode-webapp",
   "description": "Tinode messenger for the web",
-  "version": "0.18.0-rc1",
+  "version": "0.18.0-rc2",
   "repository": {
     "type": "git",
     "url": "https://github.com/tinode/example-react-js.git"
@@ -70,7 +70,7 @@
     "react": "^17.0.2",
     "react-dom": "^17.0.2",
     "react-intl": "^5.20.2",
-    "tinode-sdk": "^0.18.0-rc1"
+    "tinode-sdk": "^0.18.0-rc2"
   },
   "devDependencies": {
     "@babel/core": "^7.14.5",