Rename namespace Function keyword to Functions to prevent errors

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

src/Function/From.php

@@ -1,24 +0,0 @@
-<?php
-
-namespace Arendsen\FluxQueryBuilder\Function;
-
-use Arendsen\FluxQueryBuilder\Formatters;
-
-class From extends Base {
-
-    /**
-     * @var array $settings
-     */
-    private $settings;
-
-    public function __construct(array $settings)
-    {
-        $this->settings = $settings;
-    }
-
-    public function __toString()
-    {
-        return 'from(' . Formatters::toFluxArrayString($this->settings) . ') ';
-    }
-
-}