language: rust
rust:
  - stable
  - beta
  - nightly
  - 1.20.0

notifications:
  email:
    on_success: never

language: rust
rust:
  - stable
  - beta
  - nightly
  - 1.22.0

notifications:
  email:
    on_success: never

Increase min rustc version to 1.22
Increase min rustc version to 1.22
