Rename namespace Function keyword to Functions to prevent errors

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

src/Functions/From.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Arendsen\FluxQueryBuilder\Functions;
+
+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) . ') ';
+    }
+
+}