chore(deps): fix deps

Author: christianalfoni

package-lock.json

@@ -24,7 +24,7 @@
     "url": "git+https://github.com/cerebral/overmind.git"
   },
   "dependencies": {
-    "@babel/plugin-proposal-class-properties": "^7.8.0",
+    "@babel/plugin-proposal-class-properties": "^7.3.4",
     "@babel/plugin-syntax-dynamic-import": "^7.2.0",
     "@babel/plugin-transform-runtime": "^7.2.0",
     "@babel/preset-env": "^7.2.0",