update duplexer2 and stream-combiner2

These two were part of the streams3 update, but they didn't make it.

Author: zertosh

package.json

@@ -12,12 +12,12 @@
     "concat-stream": "~1.5.0",
     "defined": "^1.0.0",
     "detective": "^4.0.0",
-    "duplexer2": "0.0.2",
+    "duplexer2": "^0.1.2",
     "inherits": "^2.0.1",
     "parents": "^1.0.0",
     "readable-stream": "^2.0.2",
     "resolve": "^1.1.3",
-    "stream-combiner2": "~1.0.0",
+    "stream-combiner2": "^1.1.1",
     "subarg": "^1.0.0",
     "through2": "^2.0.0",
     "xtend": "^4.0.0"