Fix.

node_modules/isstream/isstream.js

@@ -1,27 +0,0 @@
-var stream = require('stream')
-
-
-function isStream (obj) {
-  return obj instanceof stream.Stream
-}
-
-
-function isReadable (obj) {
-  return isStream(obj) && typeof obj._read == 'function' && typeof obj._readableState == 'object'
-}
-
-
-function isWritable (obj) {
-  return isStream(obj) && typeof obj._write == 'function' && typeof obj._writableState == 'object'
-}
-
-
-function isDuplex (obj) {
-  return isReadable(obj) && isWritable(obj)
-}
-
-
-module.exports            = isStream
-module.exports.isReadable = isReadable
-module.exports.isWritable = isWritable
-module.exports.isDuplex   = isDuplex