fix: resolve getCurrentRemoteVersion() when latest is unstable (#12)

Author: ArnaudLigny

src/Strategy/GithubStrategy.php

@@ -116,9 +116,10 @@ public function getCurrentRemoteVersion(Updater $updater)
          * Setup remote URL if there's an actual version to download.
          */
         if (! empty($this->remoteVersion)) {
-            $chosenVersion = array_filter($package['packages'][$this->getPackageName()], function (array $package) {
+            $remoteVersionPackages = array_filter($package['packages'][$this->getPackageName()], function (array $package) {
                 return $package['version'] === $this->remoteVersion;
-            })[0];
+            });
+            $chosenVersion = reset($remoteVersionPackages);
 
             $this->remoteUrl = $this->getDownloadUrl($chosenVersion);
         }

tests/Humbug/Test/SelfUpdate/UpdaterGithubStrategyTest.php

@@ -140,6 +140,9 @@ private function createTestPharAndKey(): void
         file_put_contents($this->tmp.'/packages.json', json_encode([
             'packages' => [
                 'humbug/test-phar' => [
+                    [
+                        'version' => '2.0.0-beta.1',
+                    ],
                     [
                         'version' => '1.0.1',
                         'source' => [