Switch to PSR-4, fix CS and update service provider

src/SearchDrivers/SimpleSearchDriver.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace TomLingham\Searchy\SearchDrivers;
+
+class SimpleSearchDriver extends BaseSearchDriver
+{
+    /**
+     * @var array
+     */
+    protected $matchers = [
+        'TomLingham\Searchy\Matchers\ExactMatcher'         => 100,
+        'TomLingham\Searchy\Matchers\StartOfStringMatcher' => 50,
+        'TomLingham\Searchy\Matchers\InStringMatcher'      => 30,
+    ];
+}