fix(build): build commonjs and also expose esm wrapper

package.json

@@ -2,7 +2,7 @@
   "name": "ethr-did-resolver",
   "version": "7.0.0-alpha.1",
   "description": "Resolve DID documents for ethereum addresses and public keys",
-  "type": "module",
+  "type": "commonjs",
   "source": "./src/index.ts",
   "main": "./lib/index.js",
   "module": "./esm/index.js",