message: chore(dependencies): update minimum Rust version to 1.21, because of tokio-core
diff: @@ -13,8 +13,7 @@ matrix:
  env: FEATURES="--no-default-features"
  - rust: stable
  env: FEATURES="--features compat"
  - - rust: 1.18.0
  - env: BUILD_ONLY=1
  + - rust: 1.21.0
  cache:
  apt: true
  