Change binary_to_list for String.to_char_list!

binary_to_list/1 is deprecated. Please use String.to_char_list!/1
instead unless you are working with bytes, then you should use
:binary.bin_to_list/
Merge pull request #11 from edgurgel/elixir-v0.10.2

Change binary_to_list for String.to_char_list!