Add #!true and #!false from R2RS

hash-bang-syntax.scm

@@ -10,6 +10,10 @@
 (role object)
 (description "end-of-file object")
 
+(id false)
+(role object)
+(description "the boolean value false [R2RS, archaic]")
+
 (id fold-case)
 (role directive)
 (description "change to case insensitive identifiers [R7RS]")
@@ -38,6 +42,10 @@
 (role keyword)
 (description "start rest argument in lambda list [DSSSL]")
 
+(id true)
+(role object)
+(description "the boolean value true [R2RS, archaic]")
+
 (id void)
 (role object)
 (description "void object")