Update elixir_make to 0.8.3

[crertel]

Closes #346 .

Description

Updates elixir_make to 0.8.3.

Motivation and Context

As found in #346 , elixir_make is a bit old, and this causes Nerves to get upset. So, let's update it.

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature
  but make things better)

Checklist

• Check other PRs and make sure that the changes are not done yet.