updating docs

Author: Matt Diamond

README.md

@@ -20,6 +20,7 @@ Creates a recorder instance.
 
 - **bufferLen** - The length of the buffer that the internal JavaScriptNode uses to capture the audio. Can be tweaked if experiencing performance issues. Defaults to 4096.
 - **callback** - A default callback to be used with `exportWAV`.
+- **type** - The type of the Blob generated by `exportWAV`. Defaults to 'audio/wav'. To force a download, try setting this to 'application/octet-stream'.
 
 ---------
 #### Methods
@@ -33,10 +34,12 @@ Pretty self-explanatory... **record** will begin capturing audio and **stop** wi
 
 This will clear the recording.
 
-    rec.exportWAV([callback])
+    rec.exportWAV([callback] [, type])
 
 This will generate a Blob object containing the recording in WAV format. The callback will be called with the Blob as its sole argument. If a callback is not specified, the default callback (as defined in the config) will be used. If no default has been set, an error will be thrown.
 
+In addition, you may specify the type of Blob to be returned (defaults to 'audio/wav').
+
     rec.configure(config)
 
 This will set the configuration for Recorder by passing in a config object.