renaming 'plugin-boilerplate' to 'plugin-name' to be more consistent with the naming conventions of the class file

related #48

plugin-name/uninstall.php

@@ -0,0 +1,18 @@
+<?php
+/**
+ * Fired when the plugin is uninstalled.
+ *
+ * @package  PluginName
+ * @author   TODO
+ * @license  GPL-2.0+
+ * @link     TODO
+ * @version  1.0.0
+ * @since    1.0.0
+ */
+
+// If uninstall, not called from WordPress, then exit
+if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
+	exit;
+}
+
+// TODO: Define uninstall functionality here