remove unused bs58 core dependency

package.json

@@ -37,6 +37,7 @@
   },
   "devDependencies": {
     "browserify": "^5.12.0",
+    "bs58": "^2.0.0",
     "coveralls": "^2.11.2",
     "helloblock-js": "^0.2.5",
     "istanbul": "^0.3.2",
@@ -73,7 +74,6 @@
   },
   "dependencies": {
     "bigi": "^1.1.0",
-    "bs58": "1.2.1",
     "bs58check": "1.0.1",
     "crypto-browserify": "3.2.4",
     "ecurve": "1.0.0"

test/bitcoin.core.js

@@ -27,7 +27,7 @@ describe('Bitcoin-core', function() {
 
       it('can decode ' + fb58, function() {
         var buffer = base58.decode(fb58)
-        var actual = buffer.toString('hex')
+        var actual = new Buffer(buffer).toString('hex')
 
         assert.equal(actual, fhex)
       })