Fix Rebar3 lock file from a newer version

I recently ran into an issue where adding ```hackney``` and running ```mix deps.compile``` would throw the following error: 

>===> Rebar3 detected a lock file from a newer version. It will be loaded in compatibility mode, but important information may be missing or lost. It is recommended to upgrade Rebar3.

Running ```mix local.rebar``` fixed my issue.

Nick Ciolpan
06 Jul 2020
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