feat: replace protocol-buffers with protons

Ref ipfs/js-ipfs#991

.gitignore

@@ -40,3 +40,4 @@ test/test-data/go-ipfs-repo/LOG.old
 
 # while testing npm5
 package-lock.json
+yarn.lock

package.json

@@ -31,7 +31,7 @@
     "libp2p-crypto": "~0.10.0",
     "multihashing-async": "~0.4.6",
     "peer-id": "~0.10.0",
-    "protocol-buffers": "^3.2.1",
+    "protons": "^1.0.0",
     "pull-defer": "^0.2.2",
     "pull-handshake": "^1.1.4",
     "pull-length-prefixed": "^1.3.0",
@@ -72,4 +72,4 @@
     "Richard Littauer <richard.littauer@gmail.com>",
     "greenkeeperio-bot <support@greenkeeper.io>"
   ]
-}
+}

src/handshake/crypto.js

@@ -1,6 +1,6 @@
 'use strict'
 
-const protobuf = require('protocol-buffers')
+const protons = require('protons')
 const PeerId = require('peer-id')
 const crypto = require('libp2p-crypto')
 const parallel = require('async/parallel')
@@ -9,7 +9,7 @@ const debug = require('debug')
 const log = debug('libp2p:secio')
 log.error = debug('libp2p:secio:error')
 
-const pbm = protobuf(require('./secio.proto'))
+const pbm = protons(require('./secio.proto'))
 
 const support = require('../support')