update README

- remove note about firmware updates on 3.x problably not working (as they seem to work fine)
- remove note about pre Android 4.4, it won't be done.

README.md

@@ -38,7 +38,6 @@ need to create an account and transmit any of your data to the vendor's servers.
 All features are also supported on the Pebble Time, except for the following:
 
 * Listing installed watchfaces (it will simply display the UUIDs of previously installed watchapps, no matter if they are still installed or not)
-* Firmware installation is untested and will probably not work.
 * Installation of language files (.pbl) is not supported.
 
 ## How to use (Pebble)
@@ -81,10 +80,6 @@ All features are also supported on the Pebble Time, except for the following:
 
 Known Issues:
 
-* Android 4.4+ only, we can only change this by not handling generic
-  notifications or by using AccessibiltyService. Don't know if it is worth the
-  hassle.
-
 * The initial connection to a Mi Band sometimes takes a little patience. Try to connect a few times, wait, 
   and try connecting again. This only happens until you have "bonded" with the Mi Band, i.e. until it 
   knows your MAC address. This behavior may also only occur with older firmware versions.