Merge pull request #25 from drupal-composer/use-better-apis

Use better apis

Author: greg-1-anderson

composer.json

@@ -7,7 +7,8 @@
         "php": ">=5.4.5",
         "composer-plugin-api": "^1.0.0",
         "guzzlehttp/guzzle": "~6.1",
-        "codegyre/robo": "~0"
+        "codegyre/robo": "~0",
+        "pear/archive_tar": "~1.0"
     },
     "autoload": {
         "psr-4": {