Update .travis.yml

.travis.yml

@@ -57,6 +57,7 @@ env:
 #  - RTT_BSP='mini4020' # no scons
 #  - RTT_BSP='nios_ii' # no scons
 #  - RTT_BSP='pic32ethernet' # no scons
+  - RTT_BSP='qemu-vexpress-a9' RTT_TOOL_CHAIN='sourcery-arm'
   - RTT_BSP='sam7x' RTT_TOOL_CHAIN='sourcery-arm'
 #  - RTT_BSP='simulator' # x86
   - RTT_BSP='stm32f0x' RTT_TOOL_CHAIN='sourcery-arm'