Move default peers to config file

Can later be used to persist peer config for a node, too.

config/peers.json

@@ -0,0 +1,6 @@
+[
+  {
+    "ID": "QmRw21aC3TroRVdZhrE2Qh4W6PBA67kbE8p3fNfsVcfW8D",
+    "Addrs": ["/dns4/draco.kosmos.org/tcp/4001"]
+  }
+]

index.js

@@ -3,6 +3,7 @@
 const Kredits = require('kredits-contracts');
 const IpfsPinner = require('./lib/ipfs-pinner');
 const debug = require('debug')('ipfs-pinner');
+const defaultPeers = JSON.parse(fs.readFileSync('./config/peers.json'));
 
 const argv = require('yargs')
   .default({
@@ -12,7 +13,7 @@ const argv = require('yargs')
     port: '5001',
     protocol: 'http',
     monitor: true,
-    bootstrapNode: '/dns4/barnard.kosmos.org/tcp/4001/ipfs/QmbqZCZ2RzVr4r1UEdFak6ra76kHxtGmfV9r3e1Ev6Tj5D'
+    bootstrapNode: `${defaultPeers[0].Addrs[0]}/ipfs/${defaultPeers[0].ID}`
   })
   .boolean('monitor')
   .describe({