Raised PHP requirement to 7.1 and updated types.

Fixes #25

src/Manager/Asset_Manager.php

@@ -1,4 +1,5 @@
 <?php
+declare( strict_types=1 );
 
 namespace Rarst\Laps\Manager;
 
@@ -19,9 +20,9 @@ class Asset_Manager {
 	/**
 	 * Registers assets and queues as necessary.
 	 */
-	public function enqueue_scripts() {
+	public function enqueue_scripts(): void {
 
-		$suffix = ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ) ? '' : '.min';
+		$suffix = ( \defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ) ? '' : '.min';
 		wp_register_script( 'laps', plugins_url( "public/js/laps{$suffix}.js", dirname( __DIR__ ) ), [ 'jquery' ], '3.3.1', true );
 		wp_register_style( 'laps', plugins_url( "public/css/laps{$suffix}.css", dirname( __DIR__ ) ) );
 

src/Manager/Load_Order_Manager.php

@@ -1,4 +1,5 @@
 <?php
+declare( strict_types=1 );
 
 namespace Rarst\Laps\Manager;
 
@@ -23,9 +24,9 @@ class Load_Order_Manager {
 	 *
 	 * @return array
 	 */
-	public function pre_update_option_active_plugins( $plugins ) {
+	public function pre_update_option_active_plugins( array $plugins ): array {
 
-		$plugin = plugin_basename( dirname( dirname( __DIR__ ) ) . '/laps.php' );
+		$plugin = plugin_basename( \dirname( __DIR__, 2 ) . '/laps.php' );
 		$key    = array_search( $plugin, $plugins, true );
 
 		if ( false !== $key && $key > 0 ) {

src/Manager/Toolbar_Manager.php

@@ -1,4 +1,5 @@
 <?php
+declare( strict_types=1 );
 
 namespace Rarst\Laps\Manager;
 
@@ -29,7 +30,7 @@ class Toolbar_Manager {
 	 *
 	 * @param \WP_Admin_Bar $wp_admin_bar WordPress core toolbar object.
 	 */
-	public function admin_bar_menu( $wp_admin_bar ) {
+	public function admin_bar_menu( \WP_Admin_Bar $wp_admin_bar ): void {
 
 		if ( ! apply_filters( 'laps_can_see', current_user_can( 'manage_options' ) ) ) {
 			return;