bump min target

Merge pull request ERussel#27 from ERussel/improve/key-compression

add error handling for secp2561k1 public key uncompression

Merge pull request ERussel#26 from ERussel/feature/sec-crypto-improve…

…ments

add support for uncompressed public key

Merge pull request ERussel#24 from ERussel/fix/ss58

fix ss58 for UInt16

Merge pull request ERussel#23 from ERussel/fix/hex-encoding

Fix/hex encoding

Merge pull request ERussel#20 from ArsenyZ/patch-1

Sora should have separate address type

Merge pull request ERussel#19 from ERussel/feature/replacing-seck

fix build

address type extraction interface fix

Merge pull request ERussel#17 from ERussel/feature/ss58-type

extract type from ss58 address

Merge pull request ERussel#16 from ERussel/feature/sr25519-new-methods

add ed25519 secret key representation support