Updated revision log

Author: cmaglie

build/shared/revisions.txt

@@ -15,6 +15,8 @@ ARDUINO 1.5.3 BETA
 * sam: Added serialEvent*() support
 * sam: Fixed micros() to work with inside interrupts. (stimmer)
 * avr: Added support for Flash strings on String class (Jantje)
+* Added support for floating point numbers in String class (Tevin Zhang, SebiTimeWaster)
+* sam: Fixed String buffer overflows (Paul Stoffregen)
 
 [libraries]
 * sam: Added CAN library (still in early stage of development) (Palliser)