gitignore should not ignore itself

Author: ffissore

.gitignore

@@ -13,7 +13,6 @@ hardware/arduino/bootloaders/caterina_LUFA/Caterina.lss
 hardware/arduino/bootloaders/caterina_LUFA/Caterina.elf
 hardware/arduino/bootloaders/caterina_LUFA/Caterina.eep
 hardware/arduino/bootloaders/caterina_LUFA/.dep/
-.gitignore
 build/windows/work/
 build/linux/work/
 build/linux/dist/*.tar.gz