Use correct separator in keywords.txt (#18)

The Arduino IDE requires the use of a tab separator between the name and identifier. Without this tab the keyword is not highlighted.

Reference: https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5:-Library-specification#keywords

Author: per1234

keywords.txt

@@ -1,2 +1,2 @@
-Fsm     KEYWORD1
-State   KEYWORD1
+Fsm	KEYWORD1
+State	KEYWORD1