[ECHOT-315] Update async version of echopy-lib to Echo node version 0.17 and current synchronous version#12

Merged

eugene-vasilev merged 4 commits intomaster-asyncfrom ECHOT-315

Mar 13, 2020

+1,337-1,750

Commits on Mar 12, 2020

Update async version of echopy-lib to Echo node version 0.17
Evgenii Vasilyev
committed
Update transaction class
Evgenii Vasilyev
committed

Commits on Mar 13, 2020

Update socket resolved promises deletion, update transaction
Evgenii Vasilyev
committed
Update is_hex check
Evgenii Vasilyev
committed