We update HTTP gateway with NEP-6 wallets support, YAML configuration files and small fixes.
New features:
- YAML configuration file (#71)
Behavior changes:
- gateway key needs to be stored in a proper NEP-6 wallet now,
-k option is no longer available, see -w and -a (#68)
Bugs fixed:
- downloads were not streamed leading to excessive memory usage (#67)
- Last-Modified header incorrectly used local time (#75)
