fix: remove readme entries for sqlx-mysql, sqlx-postgres, sqlx-sqlite

Author: abonander

sqlx-mysql/Cargo.toml

@@ -1,6 +1,5 @@
 [package]
 name = "sqlx-mysql"
-readme = "README.md"
 documentation = "https://docs.rs/sqlx"
 description = "MySQL driver implementation for SQLx. Not for direct use; see the `sqlx` crate for details."
 version.workspace = true

sqlx-postgres/Cargo.toml

@@ -1,6 +1,5 @@
 [package]
 name = "sqlx-postgres"
-readme = "README.md"
 documentation = "https://docs.rs/sqlx"
 description = "PostgreSQL driver implementation for SQLx. Not for direct use; see the `sqlx` crate for details."
 version.workspace = true

sqlx-sqlite/Cargo.toml

@@ -1,6 +1,5 @@
 [package]
 name = "sqlx-sqlite"
-readme = "README.md"
 documentation = "https://docs.rs/sqlx"
 description = "SQLite driver implementation for SQLx. Not for direct use; see the `sqlx` crate for details."
 version.workspace = true