v2.0.0

Major release changes

• SRPClient.verifyServerProof() clientKeys parameter is now just the client public key.
• Removed SRPClient.calculateSimpleClientProof(), SRPServer.verifySimpleClientProof() and SRPClient.verifySimpleServerProof().
• SRP.calculateU() is no longer public
• Fixed output of SRP. calculateClientProof() by padding g before hashing it.

Minor release changes

• SRPKey now stores padding information
• Extend swift-crypto version requirements to include up v4