Update revisions.txt

Author: Federico Fissore

build/shared/revisions.txt

@@ -8,6 +8,7 @@ ARDUINO 1.6.4
 * Boards and Libraries Managers command line (with contribs from @Lauszus): --install-board "arduino:Arduino SAM Boards (32-bits ARM Cortex-M3):1.6.3" and --install-library "Bridge:1.0.1". Version can be omitted: if omitted, latest version available is automatically picked
 * Warning levels can be set in File > Preferences
 * When compilation fails, editor highlights the reported row
+* Windows: updated bunbled JVM to 1.8.0_40 (latest available atm)
 
 [libraries]
 * Bridge fixes