IO.readline has been deprecated, IO.read(device, :line) works

Tested on Interactive Elixir (0.11.2)
IO.readline has been deprecated, IO.read(device, :line) works

Tested on Interactive Elixir (0.11.2)
Fix typo.
Fixed formatting and typo.

Page was not formatted correctly. Changed 'erl' -> 'iex'.
Fix formatting.
Merge pull request #16 from benjamintanweihao/patch-8

Fix formatting.
Merge pull request #15 from benjamintanweihao/patch-7

Fixed formatting and typo.
Merge pull request #14 from benjamintanweihao/patch-6

Fix typo.
Changes to lists (formatting), Fisher-Yates shuffle (link).
Changed grammar error in comments for solution ch07-06.
Merge pull request #12 from mikulely/patch-2

IO.readline has been deprecated, IO.read(device, :line) works
Merge pull request #11 from mikulely/patch-1

IO.readline has been deprecated, IO.read(device, :line) works
Merge branch 'master' of https://github.com/oreillymedia/etudes-for-elixir
Add another contributor
Add verbiage about raising 0 to a negative power; change title of chapter 9.
Remove stray .erl files left over from Etudes for Erlang.
Eliminate call to list_to_binary; use interpolation instead.
Fix IO.read(device,:line)
Change method for referring to external functions.
Change List.concat to Enum.concat