1.4.2

The current Pebble version contains a lot of small improvements, such as:

• letsencrypt/pebble#180 Do not return deactivated accounts in newAccount
• letsencrypt/pebble#184 Only send Replay-Nonce for POSTs/newNonce endpoint
• letsencrypt/pebble#191 Return Status 200 for HEAD to new-nonce endpoint
• letsencrypt/pebble#211 Implement orderNotReady and badPublicKey error types

This makes it behave more closer to the current draft ACME standard.