Clean up workflow yaml examples.

README.md

@@ -10,9 +10,8 @@ Basic:
 ```
 name: "Close stale issues"
 on:
-  push: {}
   schedule:
-  - cron: 0 * * * *
+  - cron: "0 * * * *"
 
 jobs:
   stale:
@@ -29,9 +28,8 @@ Configure stale timeouts:
 ```
 name: "Close stale issues"
 on:
-  push: {}
   schedule:
-  - cron: 0 * * * *
+  - cron: "0 * * * *"
 
 jobs:
   stale:
@@ -49,9 +47,8 @@ Configure labels:
 ```
 name: "Close stale issues"
 on:
-  push: {}
   schedule:
-  - cron: 0 * * * *
+  - cron: "0 * * * *"
 
 jobs:
   stale: