Added test for issue briannesbitt#1075.

.travis.yml

@@ -5,14 +5,7 @@ cache:
     - $HOME/.composer/cache
 
 php:
-  - 5.3
-  - 5.4
-  - 5.5
-  - 5.6
-  - 7.0
-  - 7.0.22
-  - 7.1
-  - hhvm
+  - 7.1.2
 
 env:
   global:

tests/IssueTest.php

@@ -16,14 +16,11 @@
 
 class IssueTest extends AbstractTestCase
 {
-    public function testIssue1073()
+    public function testIssue1075()
     {
-		$date = \DateTime::createFromFormat('Y-m-d\TH:i:s.uT', '2017-07-29T13:57:27.123456Z');
-		$d1 = $date->format('Y-m-d H:i:s.u e'); // 2017-07-29 13:57:27.123456 Z
-
-		$date = Carbon::createFromFormat('Y-m-d\TH:i:s.uT', '2017-07-29T13:57:27.123456Z');
-		$d2 = $date->format('Y-m-d H:i:s.u e'); // 2017-07-29 13:57:27.000000 Z
-
-        $this->assertTrue($d1 === $d2);
+        $d = Carbon::parse('2018-01-23T03:30:45-5:00');
+        $d->addHours(1)->addMinutes(1);
+
+        $this->assertEquals('2018-01-23T04:31:45-05:00', $d->format('c'));
     }
 }