v0.6.4

v0.6.4 release.

Please, read the getting started guide for flashing instructions.

Added

• Implement gpio:init/1 on esp32 to initialize pins for GPIO usage, which some pins
  require depending on default function and bootloader code
• Implement missing opcode 161 (raw_raise), that looks more likely to be generated with Elixir code
• Support for Elixir Map.replace/3 and Map.replace!/3
• Support for Elixir Kernel.struct and Kernel.struct!
• Support for Elixir IO.iodata_to_binary/1
• Support for Elixir exceptions: Exception module and the other error related modules such as
  ArgumentError, UndefinedFunctionError, etc...
• Support for Elixir Enumerable and Collectable protocol
• Support for Elixir Enum functions: split_with, join, map_join, into, reverse,
  slice and to_list
• Support for Elixir MapSet module
• Support for Elixir Range module
• Support for Elixir Kernel.min and Kernel.max
• Support (as stub) for erlang:error/3 (that is required from Elixir code)