fix: add missing dep on class properties plugin

Author: satya164

package.json

@@ -28,7 +28,7 @@
   },
   "dependencies": {
     "@babel/core": "^7.8.4",
-    "@babel/plugin-proposal-optional-chaining": "^7.8.3",
+    "@babel/plugin-proposal-class-properties": "^7.8.3",
     "@babel/preset-env": "^7.8.4",
     "@babel/preset-flow": "^7.8.3",
     "@babel/preset-react": "^7.8.3",

yarn.lock

@@ -357,6 +357,14 @@
     "@babel/helper-remap-async-to-generator" "^7.8.3"
     "@babel/plugin-syntax-async-generators" "^7.8.0"
 
+"@babel/plugin-proposal-class-properties@^7.8.3":
+  version "7.8.3"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-class-properties/-/plugin-proposal-class-properties-7.8.3.tgz#5e06654af5cd04b608915aada9b2a6788004464e"
+  integrity sha512-EqFhbo7IosdgPgZggHaNObkmO1kNUe3slaKu54d5OWvy+p9QIKOzK1GAEpAIsZtWVtPXUHSMcT4smvDrCfY4AA==
+  dependencies:
+    "@babel/helper-create-class-features-plugin" "^7.8.3"
+    "@babel/helper-plugin-utils" "^7.8.3"
+
 "@babel/plugin-proposal-dynamic-import@^7.8.3":
   version "7.8.3"
   resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-dynamic-import/-/plugin-proposal-dynamic-import-7.8.3.tgz#38c4fe555744826e97e2ae930b0fb4cc07e66054"