mysql-native v2.1.0

[Nick Sabalausky (Abscissa)]

An all-D MySQL/MariaDB client library:
https://github.com/mysql-d/mysql-native
==========================================

Tagged 'v2.1.0', which mainly adds a few new features, including greatly 
simplified shortcut syntax for prepared statements (with automatic, 
implicit caching and re-use):

---
int i = 5;
string s = "Hello world";
conn.exec("INSERT INTO table_name VALUES (?, ?)", i, s);
conn.query("SELECT * FROM table_name WHERE id=? AND name=?", i, s);

// Also works:
Prepared stmt = conn.prepare("INSERT ...blah... (?, ?)");
conn.exec(stmt, i, s);
---

As well as additional tools for optional micro-management of 
registering/releasing prepared statements.

It also fixes #28: "MYXProtocol thrown when using large integers as 
prepared parameters."

Full changelog
https://github.com/mysql-d/mysql-native/blob/master/CHANGELOG.md#v210---2018-03-02