Update dev dependencies to resolve all npm audit findings.

Author: leMaik

.babelrc

@@ -1,4 +1,4 @@
 {
-  "presets": ["env", "react"],
-  "plugins": ["transform-class-properties", "transform-object-assign", "transform-object-rest-spread"]
+  "presets": ["@babel/preset-react", "@babel/preset-env"],
+  "plugins": ["@babel/plugin-proposal-class-properties"]
 }