updated babel

Author: timea-solid

.babelrc

@@ -4,8 +4,8 @@
     "@babel/preset-typescript"
   ],
   "plugins": [
-    "@babel/plugin-proposal-class-properties",
-    "@babel/plugin-proposal-optional-chaining",
+    "@babel/plugin-transform-class-properties",
+    "@babel/plugin-transform-optional-chaining",
     "@babel/plugin-transform-async-to-generator",
     "@babel/plugin-transform-runtime"
   ]