Merge pull request #214 from freedomofpress/format-note

Add note about supported/unsupported formats

README.md

@@ -134,7 +134,7 @@ Do not repeatedly click the “Open” icon; instead, wait for the process to co
 
 Files are opened in disposable VMs to ensure that any malware contained within files cannot access any other part of the workstation. The disposable VMs do not have Internet access, to prevent exfiltration of data through embedded resources or scripts.  Changes you make within the disposable VM will be lost after you close the associated window(s).
 
-**Note:** If an appropriate application is not available in the disposable VM, you will be alerted with the following dialog: “Unable to handle mimetype of the requested file (exit status: 768)!”. Click **OK**. The DispVM will shut down and be deleted. You should speak to your administrator or Freedom of the Press Foundation support staff about being able to open this file type.
+**Note:** If an appropriate application is not available in the disposable VM, you will be alerted with the following dialog: “Unable to handle mimetype of the requested file (exit status: 768)!”. Click **OK**. The DispVM will shut down and be deleted. Please don't hesitate to [file an issue](https://github.com/freedomofpress/securedrop-workstation/issues/new) for formats that you believe should be supported. For now, we recommend testing with TXT, PDF or MP4 files. Common word processor formats will be supported soon, once we have sufficiently hardened the installation of LibreOffice ([issue 205](https://github.com/freedomofpress/securedrop-workstation/issues/205)).
 
 While you are logged in, the workstation will check for new messages and documents every 5 minutes. You can also force a check by clicking the “Refresh” button.