update revisions log

Author: cmaglie

build/shared/revisions.txt

@@ -3,6 +3,11 @@ ARDUINO 1.6.8
 [ide]
 * Fixed a NullPointerException when dealing with some rare combination of package_*.json files
 * Fixed incorrect key bindings handling for changing tab. Thanks @matthijskooijman
+* MacOSX: Fixed handling of add indent/remove indent shortcuts (CMD+[ and CMD+])
+
+[core]
+* avr: fixed USB_SendControl(...) for buffer with len > 64. Thanks @NicoHood
+* avr: fixed yield() usage inside delay(). Thanks @vbextreme
 
 ARDUINO 1.6.7 - 2015.12.17