fix: remove use of readable-stream in Node.js

Author: daviddias

package.json

@@ -41,7 +41,6 @@
     "multihashing-async": "^0.4.6",
     "peer-id": "^0.9.0",
     "pull-stream": "^3.6.0",
-    "readable-stream": "2.3.3",
     "safe-buffer": "^5.1.1"
   },
   "devDependencies": {
@@ -64,4 +63,4 @@
     "haad <[email protected]>",
     "nginnever <[email protected]>"
   ]
-}
+}

src/files.js

@@ -8,7 +8,7 @@ const dirtyChai = require('dirty-chai')
 const expect = chai.expect
 chai.use(dirtyChai)
 const bs58 = require('bs58')
-const Readable = require('readable-stream')
+const Readable = require('stream').Readable
 const loadFixture = require('aegir/fixtures')
 const bl = require('bl')
 const isNode = require('detect-node')