Added option to add custom interval between punches (#207)

Author: supersuryaansh

README.md

@@ -73,7 +73,9 @@ Options include:
   // Supports suggested-IP to avoid DNS calls: [suggested-IP@]<host>:<port>
   bootstrap: ['host:port'],
   keyPair, // set the default key pair to use for server.listen and connect
-  connectionKeepAlive // set a default keep-alive (in ms) on all opened sockets. Defaults to 5000. Set false to turn off (advanced usage).
+  connectionKeepAlive, // set a default keep-alive (in ms) on all opened sockets. Defaults to 5000. Set false to turn off (advanced usage).
+  randomPunchInterval: 20000 // set a default time for interval between punches (in ms). Defaults to 20000.  
+  
 }
 ```
 

index.js

@@ -42,7 +42,7 @@ class HyperDHT extends DHT {
     this._validatedLocalAddresses = new Map()
 
     this._lastRandomPunch = 0
-    this._randomPunchInterval = 20000 // min 20s between random punches...
+    this._randomPunchInterval = opts.randomPunchInterval || 20000 // min 20s between random punches...
     this._randomPunches = 0
     this._randomPunchLimit = 1 // set to one for extra safety for now