v1.1.1

• Important The sr25519 interface dropped the use of verify_simple_preaudit_deprecated for signature verification, instead it now uses verify_simple. Only schnorrkel 0.8+ signatures will now pass verification. This is a follow-up of the 0.1 signing support that was dropped in a previous version.
• Rework schnorrkel signatures test vectors based on the above change (Rust, WASM and ASM.js tests)
• Rust nightly pinned to last-known-working 2020-02-17 on CI (compiler issues, should to be reverted in a future release)