Update README.md

README.md

@@ -15,5 +15,5 @@
 + `A.setDisplayMode()` displays each element of A one by one by hitting enter
 + Lists and sets can be freely converted between eachother by calling `A.__list__()` to convert A to a list or calling Set(*list*) to convert the list to a set object
 
-___Warning____
+___Warning___
 As of current, do not create sets of sets by passing in another Set object, instead just pass a list of the elements. This will be fixed soon.