Merge pull request #266 from rwtolbert/examples_distinct

add examples for distinct

Author: sogaiu

examples/distinct.janet

@@ -0,0 +1,8 @@
+(distinct @[1 2 3 2 1]) # -> @[1 2 3]
+
+(distinct [1 2 3 2 1]) # -> @[1 2 3]
+
+(distinct "bookkeeper") # -> @[98 111 107 101 112 114]
+
+(sort (map string/from-bytes
+           (distinct "bookkeeper"))) # -> @["b" "e" "k" "o" "p" "r"]