feat: replace protocol-buffers with protons (#42)

Ref ipfs/js-ipfs#991

Author: dignifiedquire

package.json

@@ -6,7 +6,6 @@
   "scripts": {
     "lint": "aegir-lint",
     "build": "aegir-build",
-    "build-proto": "pbjs --wrap commonjs --target static-module src/dag.proto > src/dag.proto.js",
     "test": "aegir-test",
     "test:node": "aegir-test node",
     "test:browser": "aegir-test browser",
@@ -53,7 +52,7 @@
     "is-ipfs": "~0.3.0",
     "multihashes": "~0.4.9",
     "multihashing-async": "~0.4.6",
-    "protobufjs": "^6.8.0",
+    "protons": "^1.0.0",
     "pull-stream": "^3.6.0",
     "pull-traverse": "^1.0.3",
     "stable": "^0.1.6"
@@ -71,4 +70,4 @@
     "pre-commit": "^1.2.2",
     "rimraf": "^2.6.1"
   }
-}
+}