2.0.0

Added

• bump Elixir to 1.16.3 and Erlang to 26.2.5.6 for testing
• change package dependency from ex_protobufs to protobufs, this is a potentially breaking change:
  • when decoding, the nested complex types are now the relevant struct, not a map
  • run mix deps.unlock --unused to clean up your mix.lock file.