Compiler warnings on Elixir 1.11.0

[Jaime Iniesta]

==> phoenix_html_simplified_helpers
Compiling 6 files (.ex)
warning: Enum.chunk/4 is deprecated. Use Enum.chunk_every/4 instead
  lib/phoenix_html_simplified_helpers/number_with_delimiter.ex:8: Phoenix.HTML.SimplifiedHelpers.NumberWithDelimiter.number_with_delimiter/1

Generated phoenix_html_simplified_helpers app