Raised PHP requirement to 7.1 and updated types.

Fixes #25

src/Record/Stopwatch_Record.php

@@ -1,4 +1,5 @@
 <?php
+declare( strict_types=1 );
 
 namespace Rarst\Laps\Record;
 
@@ -19,7 +20,7 @@ class Stopwatch_Record implements Record_Interface {
 	 * @param string         $name            Event name.
 	 * @param StopwatchEvent $stopwatch_event Stopwatch event instance.
 	 */
-	public function __construct( $name, StopwatchEvent $stopwatch_event ) {
+	public function __construct( string $name, StopwatchEvent $stopwatch_event ) {
 		$this->name            = $name;
 		$this->stopwatch_event = $stopwatch_event;
 	}
@@ -27,14 +28,14 @@ class Stopwatch_Record implements Record_Interface {
 	/**
 	 * @return string
 	 */
-	public function get_name() {
+	public function get_name(): string {
 		return $this->name;
 	}
 
 	/**
 	 * @return string
 	 */
-	public function get_description() {
+	public function get_description(): string {
 
 		$duration = round( $this->stopwatch_event->getDuration() );
 		$memory   = $this->stopwatch_event->getMemory() / 1024 / 1024;
@@ -45,21 +46,21 @@ class Stopwatch_Record implements Record_Interface {
 	/**
 	 * @return float Timestamp of record start.
 	 */
-	public function get_origin() {
+	public function get_origin(): float {
 		return $this->stopwatch_event->getOrigin() / 1000; // ms to s.
 	}
 
 	/**
 	 * @return float Record duration in seconds.
 	 */
-	public function get_duration() {
+	public function get_duration(): float {
 		return $this->stopwatch_event->getDuration() / 1000; // ms to s.
 	}
 
 	/**
 	 * @return string
 	 */
-	public function get_category() {
+	public function get_category(): string {
 		return $this->stopwatch_event->getCategory();
 	}
 }