Add Range.rand

Author: titsuki

doc/Type/Range.pod6

@@ -309,6 +309,17 @@ L«C<.excludes-max>|/type/Range#method_excludes-max»,
 L«C<.infinite>|/type/Range#method_infinite», and
 L«C<.is-int>|/type/Range#method_is-int» as named arguments.
 
+=head2 method rand
+
+Defined as:
+
+    method rand(Range:D --> Num:D)
+
+Returns a pseudo-random value belongs to the range.
+
+    say (1^..5).rand;                              # OUTPUT: «1.02405550417031␤»
+    say (0.1..0.3).rand;                           # OUTPUT: «0.2130353370062␤»
+
 =end pod
 
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