change version comparison so that a version without a pre-release suf…

…fix is always greater than a version with a pre-release suffix

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 All notable changes to phar-io/version are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
+## [2.0.1] - 08.07.2018
+
+### Fixed
+
+- Versions without a pre-release suffix are now always considered greater 
+than versions without a pre-release suffix. Example: `3.0.0 > 3.0.0-alpha.1`  
+
 ## [2.0.0] - 23.06.2018
 
 Changes to public API:
@@ -33,4 +40,5 @@ Changes to public API:
 - [#10](https://github.com/phar-io/version/issues/10): Version numbers containing 
 a numeric suffix as seen in Debian packages are now supported.  
 
+[2.0.1]: https://github.com/phar-io/version/compare/2.0.0...2.0.1
 [2.0.0]: https://github.com/phar-io/version/compare/1.0.1...2.0.0

src/Version.php

@@ -101,11 +101,11 @@ public function isGreaterThan(Version $version) {
         }
 
         if ($version->hasPreReleaseSuffix() && !$this->hasPreReleaseSuffix()) {
-            return false;
+            return true;
         }
 
         if (!$version->hasPreReleaseSuffix() && $this->hasPreReleaseSuffix()) {
-            return true;
+            return false;
         }
 
         return $this->getPreReleaseSuffix()->isGreaterThan($version->getPreReleaseSuffix());

tests/Unit/VersionTest.php

@@ -84,6 +84,8 @@ public function versionGreaterThanProvider() {
             [new Version('2.5.8'), new Version('3.1.2'), false],
             [new Version('3.0.0-alpha1'), new Version('3.0.0-alpha2'), false],
             [new Version('3.0.0-alpha2'), new Version('3.0.0-alpha1'), true],
+            [new Version('3.0.0-alpha.1'), new Version('3.0.0'), false],
+            [new Version('3.0.0'), new Version('3.0.0-alpha.1'), true],
         ];
     }