Specify GitHub settings (#2)

Author: andygrove

.asf.yaml

@@ -20,3 +20,12 @@ notifications:
   issues:       [email protected]
   pullrequests: [email protected]
   jira_options: link label worklog
+github:
+  description: "Official Rust implementation of Apache Arrow"
+    homepage: https://arrow.apache.org/
+  enabled_merge_buttons:
+    squash: true
+    merge: false
+    rebase: false
+  features:
+    issues: true