v1.1.0-rc.0

This release upgrades gcc from version 6.3.0 to 7.3.0. This addresses a C++
compiler issue and may bring in performance improvements.

• Tool versions

  • glibc 2.27
  • muslc 1.1.19

• Updated dependencies

  • nerves v1.1
  • nerves_toolchain_ctng v1.5