README: describre rustls-tls feature

Author: blackbeam

Cargo.toml

@@ -55,6 +55,7 @@ optional = true
 [dependencies.rustls]
 version = "0.23"
 default-features = false
+features = ["std"]
 optional = true
 
 [dependencies.rustls-pemfile]

README.md

@@ -65,7 +65,16 @@ By default there are only two features enabled:
 
     ```toml
     [dependencies]
-    mysql_async = { version = "*", default-features = false, features = ["native-tls-tls"] }
+    mysql_async = { version = "*", default-features = false, features = ["minimal", "native-tls-tls"] }
+
+*   `rustls-tls` - enables rustls TLS backend with no provider. You should enable one
+    of existing providers using `aws-lc-rs` or `ring` features:
+
+    **Example:**
+
+    ```toml
+    [dependencies]
+    mysql_async = { version = "*", default-features = false, features = ["minimal-rust", "rustls-tls", "ring"] }
 
 *   `tracing` – enables instrumentation via `tracing` package.
 

azure-pipelines.yml

@@ -43,13 +43,13 @@ jobs:
           SSL=false COMPRESS=false cargo test
           SSL=true COMPRESS=false cargo test --features native-tls-tls
           SSL=false COMPRESS=true cargo test
-          SSL=true COMPRESS=true cargo test --features rustls-tls
+          SSL=true COMPRESS=true cargo test --features rustls-tls,ring
 
           SSL=true COMPRESS=false cargo check --no-default-features --features default-rustls
           SSL=true COMPRESS=false cargo check --no-default-features --features default-rustls-ring
           SSL=true COMPRESS=false cargo check --no-default-features --features minimal
           SSL=true COMPRESS=false cargo check --no-default-features --features minimal-rust
-          SSL=true COMPRESS=false cargo check --no-default-features --features tracing
+          SSL=true COMPRESS=false cargo check --no-default-features --features minimal,tracing
         env:
           RUST_BACKTRACE: 1
           DATABASE_URL: mysql://root:[email protected]:3306/mysql

src/lib.rs

@@ -64,7 +64,16 @@
 //!
 //!     ```toml
 //!     [dependencies]
-//!     mysql_async = { version = "*", default-features = false, features = ["native-tls-tls"] }
+//!     mysql_async = { version = "*", default-features = false, features = ["minimal", "native-tls-tls"] }
+//!
+//! *   `rustls-tls` - enables rustls TLS backend with no provider. You should enable one
+//!     of existing providers using `aws-lc-rs` or `ring` features:
+//!
+//!     **Example:**
+//!
+//!     ```toml
+//!     [dependencies]
+//!     mysql_async = { version = "*", default-features = false, features = ["minimal-rust", "rustls-tls", "ring"] }
 //!
 //! *   `tracing` – enables instrumentation via `tracing` package.
 //!