Coherence Demo Project is out of date

[fijiaaron]

The Coherence Demo Project linked in the readme (https://github.com/smpallen99/coherence_demo) hasn't been updated in 7 years.

Lots of deprecation warnings and eventually fails to compile certifi

Compiling src/certifi.erl failed
src/certifi.erl:none: error in parse transform 'certifi_pt':
exception error: no match of right hand side value {error,enoent}
  in function  certifi_pt:replace_cacerts/1 (/Users/aaronevans/scratch/coherence_demo/deps/certifi/src/certifi_pt.erl, line 14)
  in call from certifi_pt:'-parse_transform/2-lc$^0/1-0-'/1 (/Users/aaronevans/scratch/coherence_demo/deps/certifi/src/certifi_pt.erl, line 5)
  in call from certifi_pt:'-parse_transform/2-lc$^0/1-0-'/1 (/Users/aaronevans/scratch/coherence_demo/deps/certifi/src/certifi_pt.erl, line 5)
  in call from compile:foldl_transform/3 (compile.erl, line 2031)
  in call from compile:fold_comp/4 (compile.erl, line 1198)
  in call from compile:internal_comp/5 (compile.erl, line 1173)
  in call from compile:'-internal_fun/2-anonymous-0-'/2 (compile.erl, line 1001)
  in call from rebar_compiler_erl:compile_and_track/4 (/rebar3/apps/rebar/src/rebar_compiler_erl.erl, line 157)

** (Mix) Could not compile dependency :certifi, "/Users/aaronevans/.mix/elixir/1-16/rebar3 bare compile --paths /Users/aaronevans/scratch/coherence_demo/_build/dev/lib/*/ebin" command failed. Errors may have been logged above. You can recompile this dependency with "mix deps.compile certifi --force", update it with "mix deps.update certifi" or clean it with "mix deps.clean certifi"

It could be me, but should this demo still work, does it need updated with more recent versions of libraries, or should it be removed from the docs?