update docs

Author: jbr

README.md

@@ -28,10 +28,17 @@ async-sqlx-session = { version = "0.3.0", features = ["sqlite"] }
 async-sqlx-session = { version = "0.3.0", features = ["pg"] }
 ```
 
+### mysql: 
+
+```toml
+async-sqlx-session = { version = "0.3.0", features = ["mysql"] }
+```
+
 ### Optional `async_std` feature
 
-To use the `spawn_cleanup_task` function on async-std, enable the
-`async_std` feature.
+To use the `spawn_cleanup_task` function on the async-std runtime,
+enable the `async_std` feature, which can be combined with any of the
+above datastores.
 
 ```toml
 async-sqlx-session = { version = "0.3.0", features = ["pg", "async_std"] }

src/lib.rs

@@ -1,14 +1,14 @@
 /*!
 # async-sqlx-session
 
-This crate currently provides two session stores:
-[`PostgresSessionStore`] and [`SqliteSessionStore`], each of which
-is enabled by a feature flag.
+This crate currently provides several session stores, each of which is
+enabled by a feature flag.
 
-To use [`SqliteSessionStore`], enable the `sqlite` feature on this
+* To use [`SqliteSessionStore`], enable the `sqlite` feature on this
 crate.
-
-To use [`PostgresSessionStore`], enable the `pg` feature on this
+* To use [`PostgresSessionStore`], enable the `pg` feature on this
+crate.
+* To use [`MysqlSessionStore`], enable the `mysql` feature on this
 crate.
 
 To use the `spawn_cleanup_task` function for either store on