BIP39 version bump

v0.9.19

BIP39 version bump

Converted license to Apache 2.0

Update README.md with more examples

Compatibility fixes

v0.9.17

Compatibility fixes

Added checks to improve performance

v0.9.16

Added checks to improve performance

Fixed bug in transaction version check

v0.9.15

Updated runtime_state unit tests

Include transaction version to signature payload

v0.9.14

Detect if transaction version is part of signature payload

Added Keypair signing and verifying

v0.9.13

Changed debug log level

Added Keypair signing and verifying

Added generate_signature_payload() function

Added Keypair sign and verify functions
Added Keypair unittests

Creating and sending of signed extrinsics

v0.9.11

Added encoding of extrinsics

Creating and sending of signed extrinsics

v0.9.10

Creating and sending of signed extrinsics