chore: replace err-code with CodeError (#42)

Replaces
[err-code](https://github.com/IndigoUnited/js-err-code/blob/master/index.js)
with
[CodeError](libp2p/js-libp2p-interfaces#314)

Related:
[js-libp2p#1269](#1269)

Changes

- removes err-code from dependencies
- adds @libp2p/interfaces@3.2.0 to dependencies
- uses CodeError in place of err-code

package.json

@@ -149,11 +149,11 @@
     "@libp2p/crypto": "^1.0.11",
     "@libp2p/interface-peer-id": "^2.0.0",
     "@libp2p/interface-record": "^2.0.1",
+    "@libp2p/interfaces": "^3.2.0",
     "@libp2p/logger": "^2.0.5",
     "@libp2p/peer-id": "^2.0.0",
     "@libp2p/utils": "^3.0.0",
     "@multiformats/multiaddr": "^11.0.0",
-    "err-code": "^3.0.1",
     "interface-datastore": "^7.0.0",
     "it-all": "^2.0.0",
     "it-filter": "^2.0.0",

src/envelope/index.ts

@@ -1,4 +1,4 @@
-import errCode from 'err-code'
+import { CodeError } from '@libp2p/interfaces/errors'
 import { fromString as uint8arraysFromString } from 'uint8arrays/from-string'
 import { equals as uint8ArrayEquals } from 'uint8arrays/equals'
 import { unmarshalPrivateKey, unmarshalPublicKey } from '@libp2p/crypto/keys'
@@ -66,7 +66,7 @@ export class RecordEnvelope implements Envelope {
     const valid = await envelope.validate(domain)
 
     if (!valid) {
-      throw errCode(new Error('envelope signature is not valid for the given domain'), codes.ERR_SIGNATURE_NOT_VALID)
+      throw new CodeError('envelope signature is not valid for the given domain', codes.ERR_SIGNATURE_NOT_VALID)
     }
 
     return envelope