v1.7.0

Nerves 1.7.0 removes support for creating OTP releases using Distillery and
only supports using Elixir releases. As a result, the minimum supported version
of Elixir is now version 1.9.

Official Nerves systems now support applying firmware using patches. This
greatly reduces the amount of data that required to push firmware updates
to devices. The minimum requirement for fwup has been updated to 1.8
to enable support for this feature.

• Bug fixes
  • Pass all unspecified erlinit args to the generator instead of silently
    ignoring them.
  • Use host CC when compiling the port.