update revision log

Author: facchinm

build/shared/revisions.txt

@@ -5,10 +5,18 @@ ARDUINO 1.6.9
 * Fixed IDE version color on about dialog box. Thanks @ivanebernal
 * The "always-on-top update notification" popup is now less intrusive.
 * Fixed untraslated string during IDE startup splash window. Thanks @ivanebernal
+* New arduino-builder: better core library detection, faster operations when recompiling and more. See https://github.com/arduino/arduino-builder/compare/1.3.9...1.3.15
+* Fixed multitab error reporting
+* Rework serial port discovery to be faster, less cpu intensive and FTDI friendly
+* Avoid launching multiple concurrent compile and upload operation
+* Use hi-res icons for Serial monitor and plotter
+* Make http://librarymanager and http://boardmanager links clickable from the editor window
 
 [core]
 * sam: Allow 3rd party boards that depend on SAM core to use their own
        USB vid/pid and manufacturer/product strings. Thanks @philmanofsky.
+* avr: Check at runtime if 32u4 boards are shipped with new bootloader; if so
+       write bootloader magic value in an unproblematic RAM location
 
 [libraries]