fix: Update karma and add babelify to browserify

Author: germanattanasio

.babelrc

@@ -0,0 +1,16 @@
+{
+  "presets": [
+    [ "@babel/preset-env",
+    {
+      "targets": {
+        "edge": "17",
+        "firefox": "60",
+        "chrome": "67",
+        "safari": "11.1"
+      },
+      "useBuiltIns": "usage",
+      "corejs": 3
+    }
+    ]
+  ]
+}