Release of version 0.4.0 of EOSRPC

Release of version 0.4.0 of EOSRPC

This release includes:

• New error handling strategy
• Improved compatibility with EOS RPC 1.2
• Logger for request error

EOSRPC no longer throws exceptions as the default. Now it returns the result tuples: {:ok, result} for successful execution and {:error, reason} for errors

If you want EOS RPC to throw exceptions, you should use the ! variation, all functions have been updated to support it

EOS RPC merged account_history and history APIs, and so did EOSRPC, now all history related endpoints are on EOSRPC.History just as the official documentation for EOS RPC interface

EOSRPC now logs all failures that are called with the bang variation (!). It can help on production debugging. It uses Elixir default Logger library