chore(package): update @babel/plugin-proposal-class-properties to version 7.10.1

Closes #115

Author: greenkeeper[bot]

package.json

@@ -59,7 +59,7 @@
     "@babel/cli": "7.10.1",
     "@babel/core": "7.10.1",
     "@babel/node": "7.10.1",
-    "@babel/plugin-proposal-class-properties": "7.8.3",
+    "@babel/plugin-proposal-class-properties": "7.10.1",
     "@babel/plugin-proposal-decorators": "7.8.3",
     "@babel/plugin-proposal-do-expressions": "7.8.3",
     "@babel/plugin-proposal-export-default-from": "7.8.3",