Use correct separator in keywords.txt

The Arduino IDE currently 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

@@ -1,22 +1,22 @@
-JTEncode KEYWORD1
+JTEncode	KEYWORD1
 
-jt65_encode KEYWORD2
-jt9_encode KEYWORD2
-jt4_encode KEYWORD2
-wspr_encode KEYWORD2
-ft8_encode KEYWORD2
-fsq_encode KEYWORD2
-fsq_dir_encode KEYWORD2
+jt65_encode	KEYWORD2
+jt9_encode	KEYWORD2
+jt4_encode	KEYWORD2
+wspr_encode	KEYWORD2
+ft8_encode	KEYWORD2
+fsq_encode	KEYWORD2
+fsq_dir_encode	KEYWORD2
 
-JT65_SYMBOL_COUNT LITERAL1
-JT9_SYMBOL_COUNT LITERAL1
-JT4_SYMBOL_COUNT LITERAL1
-WSPR_SYMBOL_COUNT LITERAL1
-FT8_SYMBOL_COUNT LITERAL1
-JT65_ENCODE_COUNT LITERAL1
-JT9_ENCODE_COUNT LITERAL1
-FT8_ENCODE_COUNT LITERAL1
-JT9_BIT_COUNT LITERAL1
-JT4_BIT_COUNT LITERAL1
-WSPR_BIT_COUNT LITERAL1
-FT8_BIT_COUNT LITERAL1
+JT65_SYMBOL_COUNT	LITERAL1
+JT9_SYMBOL_COUNT	LITERAL1
+JT4_SYMBOL_COUNT	LITERAL1
+WSPR_SYMBOL_COUNT	LITERAL1
+FT8_SYMBOL_COUNT	LITERAL1
+JT65_ENCODE_COUNT	LITERAL1
+JT9_ENCODE_COUNT	LITERAL1
+FT8_ENCODE_COUNT	LITERAL1
+JT9_BIT_COUNT	LITERAL1
+JT4_BIT_COUNT	LITERAL1
+WSPR_BIT_COUNT	LITERAL1
+FT8_BIT_COUNT	LITERAL1