0.4.0

Changed

• changed to BIP66 lib for DER ser/des. (#88)
• updated vendorField to support 255 bytes in Core v2.4 (#84)
• updated ArduinoJson package to version v.6.10.0 (#76)
• updated tests to use Core fixtures (#74)
• improved Windows support (#83)

Fixed

• properly handle 0 ARKtoshi Transaction amounts. (#85)