travis: added PHP 7.3

Author: dg

.travis.yml

@@ -2,6 +2,7 @@ language: php
 php:
     - 7.1
     - 7.2
+    - 7.3
 
 env:
     - PHP_BIN=php

readme.md

@@ -41,9 +41,9 @@ composer require tracy/tracy
 
 Alternatively, you can download the whole package or [tracy.phar](https://github.com/nette/tester/releases) file.
 
-Tracy 3.0-dev requires PHP version 7.1 or newer (supports PHP up to 7.2) and is compatible with Chrome 49+, Firefox 45+, MS Edge 12+, Safari 10+ and iOS Safari 10.2+.
+Tracy 3.0-dev requires PHP version 7.1 or newer (supports PHP up to 7.3) and is compatible with Chrome 49+, Firefox 45+, MS Edge 12+, Safari 10+ and iOS Safari 10.2+.
 
-Tracy 2.5 requires PHP version 5.4.4 or newer (supports PHP up to 7.2) and is compatible with Chrome 49+, Firefox 45+, MS Edge 12+, Safari 10+ and iOS Safari 10.2+.
+Tracy 2.5 requires PHP version 5.4.4 or newer (supports PHP up to 7.3) and is compatible with Chrome 49+, Firefox 45+, MS Edge 12+, Safari 10+ and iOS Safari 10.2+.
 
 Tracy 2.4 requires PHP version 5.4.4 or newer (supports PHP up to 7.2) and is compatible with Chrome 29+, Firefox 28+, IE 11+ (except AJAX), MS Edge 12+, Safari 9+ and iOS Safari 9.2+.