Fix hikari for mysql and sqlite

src/main/java/fr/xephi/authme/datasource/MySQL.java

@@ -37,7 +37,6 @@ public class MySQL implements DataSource {
     private List<String> columnOthers;
     private HikariDataSource ds;
     private String columnRealName;
-    private Connection connection;
 
     public MySQL() throws ClassNotFoundException, SQLException, PoolInitializationException {
         this.host = Settings.getMySQLHost;

src/main/java/fr/xephi/authme/datasource/SQLite_HIKARI.java

@@ -122,7 +122,8 @@ public class SQLite_HIKARI implements DataSource {
             throws ClassNotFoundException, IllegalArgumentException {
         HikariConfig config = new HikariConfig();
         config.setPoolName("AuthMeSQLitePool");
-        config.setDataSourceClassName("org.sqlite.SQLiteDataSource");
+        config.setDriverClassName("org.sqlite.JDBC");
+        config.setDataSourceClassName("org.sqlite.javax.SQLiteConnectionPoolDataSource");
         config.setJdbcUrl("jdbc:sqlite:plugins/AuthMe/" + database + ".db");
         config.setInitializationFailFast(true); // Don't start the plugin if the database is unavariable
         config.setConnectionTestQuery("SELECT 1");