deps!: update @libp2p/interface-peer-discovery to 2.0.0 (libp2p#197)

Updates the interface and symbol return type

Author: achingbrain

package.json

@@ -135,7 +135,7 @@
     "docs": "aegir docs"
   },
   "dependencies": {
-    "@libp2p/interface-peer-discovery": "^1.0.5",
+    "@libp2p/interface-peer-discovery": "^2.0.0",
     "@libp2p/interface-peer-info": "^1.0.8",
     "@libp2p/interfaces": "^3.3.1",
     "@libp2p/logger": "^2.0.5",

src/index.ts

@@ -1,4 +1,4 @@
-import { symbol } from '@libp2p/interface-peer-discovery'
+import { peerDiscovery } from '@libp2p/interface-peer-discovery'
 import { CustomEvent, EventEmitter } from '@libp2p/interfaces/events'
 import { logger } from '@libp2p/logger'
 import multicastDNS from 'multicast-dns'
@@ -55,7 +55,7 @@ class MulticastDNS extends EventEmitter<PeerDiscoveryEvents> implements PeerDisc
     this._onMdnsResponse = this._onMdnsResponse.bind(this)
   }
 
-  readonly [symbol] = true
+  readonly [peerDiscovery] = this
 
   readonly [Symbol.toStringTag] = '@libp2p/mdns'