v2.8

• Updated cpp-driver to 2.5.0
• Updated lager to 3.2.4
• Fix several bugs in compiling scripts
• Don't throw exception in case of bad arguments. Return {error, badarg} instead
• Add more descriptive errors in case of bad options
• Add versions for async_execute where caller can specify the process that's going to receive the response and the tag used to match
  the request with the response.
• Add support for fire and forget async requests (response is never sent back, it's only logged in case fails). Use ReceiverPid = null in
  async_execute/5 or async_execute_statement/3.