Merge branch 'hotfix/81' into develop

Forward port #81

CHANGELOG.md

@@ -45,6 +45,10 @@ All notable changes to this project will be documented in this file, in reverse
   versions, and updates whoops to allow either 1.1 or 2.0 versions.
 - [#80](https://github.com/zendframework/zend-expressive-skeleton/pull/80)
   updates the default ProxyManager constraints to also allow v2 versions.
+- [#81](https://github.com/zendframework/zend-expressive-skeleton/pull/81)
+  fixes an issue in the installer whereby specified constraints were not being
+  passed to Composer prior to dependency resolution/installation, resulting in
+  stale dependencies.
 
 ## 1.0.0 - 2016-01-28
 

src/ExpressiveInstaller/OptionalPackages.php

@@ -319,8 +319,12 @@ public static function addPackage(IOInterface $io, $packageName, $packageVersion
             $packageVersion
         ));
 
+        // Get the version constraint
+        $versionParser = new VersionParser();
+        $constraint = $versionParser->parseConstraints($packageVersion);
+
         // Create package link
-        $link = new Link('__root__', $packageName, null, 'requires', $packageVersion);
+        $link = new Link('__root__', $packageName, $constraint, 'requires', $packageVersion);
 
         // Add package to the root package and composer.json requirements
         if (in_array($packageName, self::$config['require-dev'])) {