Devise a function that gets one parameter 'w' and returns all the anagrams for 'w' from the file
wl.txt.

"Anagram": An anagram is a type of word play, the result of rearranging the letters of a word or
phrase to produce a new word or phrase, using all the original letters exactly once; for example
orchestra can be rearranged into carthorse.

anagrams("horse") should return:
['heros', 'horse', 'shore']