Readme - TravisCI badge - do not support PHP 7.2, because friendsofphp/php-cs-fixer package can be run using PHP lower than 7.2 only

Details:
$ composer install
Your requirements could not be resolved to an installable set of packages
friendsofphp/php-cs-fixer v2.3.2 requires php ^5.6 || >=7.0 <7.2 -> your PHP version (7.3.0-dev) does not satisfy that requirement

.travis.yml

@@ -2,5 +2,11 @@ language: php
 
 php:
   - 5.6
+  - 7.0
   - 7.1
-  - nightly
+
+install:
+  - composer install
+
+script:
+  - php ./vendor/bin/phpunit

composer.json

@@ -2,7 +2,7 @@
     "name": "meritoo/common-library",
     "description": "Useful classes, methods, extensions etc.",
     "license": "MIT",
-    "version": "0.0.6",
+    "version": "0.0.7",
     "authors": [
         {
             "name": "Meritoo.pl",

tests/Meritoo/Common/Test/Utilities/DateTest.php

@@ -454,8 +454,11 @@ class DateTest extends BaseTestCase
         $start = 1;
         $end = 100;
 
-        $intervalMinDate = (clone $startDate)->add(new DateInterval(sprintf('P%dD', $start)));
+        $minDate = clone $startDate;
-        $intervalMaxDate = (clone $startDate)->add(new DateInterval(sprintf('P%dD', $end)));
+        $maxDate = clone $startDate;
+
+        $intervalMinDate = $minDate->add(new DateInterval(sprintf('P%dD', $start)));
+        $intervalMaxDate = $maxDate->add(new DateInterval(sprintf('P%dD', $end)));
 
         $randomDate = Date::getRandomDate();
         self::assertTrue($randomDate >= $intervalMinDate && $randomDate <= $intervalMaxDate);
@@ -471,7 +474,9 @@ class DateTest extends BaseTestCase
     public function testGetRandomDateIncorrectEnd(DateTime $startDate, $start, $end)
     {
         $randomDate = Date::getRandomDate($startDate, $start, $end);
-        $intervalDate = (clone $startDate)->add(new DateInterval(sprintf('P%dD', $start)));
+
+        $cloned = clone $startDate;
+        $intervalDate = $cloned->add(new DateInterval(sprintf('P%dD', $start)));
 
         self::assertTrue($randomDate >= $intervalDate && $randomDate <= $intervalDate);
     }
@@ -487,8 +492,11 @@ class DateTest extends BaseTestCase
     {
         $randomDate = Date::getRandomDate($startDate, $start, $end);
 
-        $intervalMinDate = (clone $startDate)->add(new DateInterval(sprintf('P%dD', $start)));
+        $minDate = clone $startDate;
-        $intervalMaxDate = (clone $startDate)->add(new DateInterval(sprintf('P%dD', $end)));
+        $maxDate = clone $startDate;
+
+        $intervalMinDate = $minDate->add(new DateInterval(sprintf('P%dD', $start)));
+        $intervalMaxDate = $maxDate->add(new DateInterval(sprintf('P%dD', $end)));
 
         self::assertTrue($randomDate >= $intervalMinDate && $randomDate <= $intervalMaxDate);
     }