remove deployer 6.x leftovers (#3994)

since deployer 7.x the `success` task is named `deploy:success`

Co-authored-by: Markus Staab <[email protected]>

Author: staabm

contrib/chatwork.php

@@ -77,7 +77,7 @@
 If you want to notify about successful end of deployment add this too:
 
 ```php
-after('success', 'chatwork:notify:success');
+after('deploy:success', 'chatwork:notify:success');
 ```
 If you want to notify about failed deployment add this too:
 

docs/contrib/chatwork.md

@@ -74,7 +74,7 @@ before('deploy', 'chatwork:notify');
 ```
 If you want to notify about successful end of deployment add this too:
 ```php
-after('success', 'chatwork:notify:success');
+after('deploy:success', 'chatwork:notify:success');
 ```
 If you want to notify about failed deployment add this too:
 ```php