Merge pull request #269 from rwtolbert/examples_filter

add examples for filter

Author: sogaiu

examples/filter.janet

@@ -0,0 +1,7 @@
+(filter pos? [1 2 3 0 -4 5 6]) # -> @[1 2 3 5 6]
+
+(filter |(> (length $) 3) ["hello" "goodbye" "hi"]) # -> @["hello" "goodbye"]
+
+(filter |(< (chr "A") $) "foo01bar") # -> @[102 111 111 98 97 114]
+
+(string/from-bytes ;(filter |(< (chr "A") $) "foo01bar")) # -> "foobar"