[Breaking] update deep-equal to v2

Author: ljharb

package.json

@@ -9,7 +9,7 @@
         "test": "test"
     },
     "dependencies": {
-        "deep-equal": "~1.1.1",
+        "deep-equal": "~2.0.1",
         "defined": "~1.0.0",
         "for-each": "~0.3.3",
         "function-bind": "~1.1.1",