Fix symbolic link

Include symbolic link to latest Dockerfile

Merge branch 'release/19.0'

Introduce Erlang 18.3 with updated rebar3 and relx versions

Merge pull request #13 from synlay/feature/erlang_otp_18.2

Introduce Erlang/OTP 18.2 docker build file and update README

Merge pull request #12 from synlay/feature/hipe_17.5_18.0_tweaks

Relax library versions with a wildcard for consecutive builds and update ImageLayer badge

Update relx & rebar version to pin some other dependencies