v0.4.3

Support recover public key from signature

v0.4.1

adopt the flutter web.
fix issue #5

v0.3.2

• fix signature bug which used signed bigendian bytes from big int

canonical signature support

• Support canonical signature

v0.2.2

• Healthy change

v0.2.0

• EOSPublicKey, EOSPrivateKey, EOSSignature
• Sign the data
• Verify the signature