fixing deprecation warnings for Elixir master
Merge pull request #2 from guedes/patch-1

fixing deprecation warnings for Elixir master
Add Hex config
Bump Hex version
String.from_char_data! is no longer available, changing to use to_string
Merge pull request #4 from bbrietzke/from_char_data

String.from_char_data! is no longer available, changing to use to_string
Bump verison and Elixir dep