Update README.md

Author: Zheyuan Chen

README.md

@@ -75,9 +75,6 @@ pipe(['google', 'twitter', 'yahoo', 'facebook', 'github'])
 1 /of/ int
 # equivalent to `isinstance(1, int)`
 
-[1,2,3,4,5] /contains/ 3
-# equivalent to `3 in [1,2,3,4,5]`
-
 1 /to/ 10
 # equivalent to `range(1, 11)`
 # Python's nasty range() is right-exclusive. This is right-inclusive.