syntax: javascript: colorize the boolean values 'true' and 'false' too

Original-patch-by: Ryan Westlund <rlwestlund@gmail.com>

syntax/javascript.nanorc

@@ -14,7 +14,7 @@ color magenta "\<(break|continue|return|yield)\>"
 # Octal/decimal and hexadecimal numbers.
 color cyan "\<[0-9]+\>" "\<0x[0-9A-Fa-f]+\>"
 # Special values.
-color cyan "\<(null|undefined)\>"
+color cyan "\<(true|false|null|undefined)\>"
 
 # Strings.
 color brightmagenta ""(\\.|[^"])*"" "'(\\.|[^'])*'" "`(\\.|[^`])*`"