Merge pull request #82 from stevemao/patch-2

symlink opt.base should be the same as dest

Author: contra

README.md

@@ -117,6 +117,7 @@ This is just [glob-watcher].
     - Default is `process.cwd()`.
   - base - Specify the folder relative to the cwd. This is used to determine the file names when saving in `.dest()`.
     - Default is the `cwd` resolves to the folder path.
+    - Can also be a function that takes in a file and returns a folder path.
   - dirMode - Specify the mode the directory should be created with.
     - Default is the process mode.
 - Returns a Readable/Writable stream.