Rename namespace Function keyword to Functions to prevent errors

Signed-off-by: davidarendsen <davidarendsen@hey.com>

src/Function/Base.php

@@ -1,17 +0,0 @@
-<?php
-
-namespace Arendsen\FluxQueryBuilder\Function;
-
-use Arendsen\FluxQueryBuilder\Formatters;
-
-abstract class Base {
-
-	/**
-	 * @throws FunctionNotImplementedException
-	 */
-	public function __toString()
-    {
-		throw new FunctionNotImplementedException('__toString', get_class($this));
-	}
-
-}