Merge pull request #9 from drupal-composer/weitzman-patch-1

Update for drush9

Author: weitzman

README.md

@@ -39,7 +39,7 @@ In the rare event that a security release does not affect your project, and upgr
 
  ```
 
-Note: that this approach opts your package out of any future security releases. You can check for future security releases with `drush pm-updatestatus`.
+Note: that this approach opts your package out of any future security releases. You can check for future security releases with `drush pm:security` (drush9) or `drush pm-updatestatus` (drush8).
 
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