Fix PR labeler (#468)

* Fix PR labeler

Author: Dandandan

.github/workflows/dev_pr.yml

@@ -18,7 +18,11 @@
 name: Dev PR
 
 on:
-  pull_request:
+  pull_request_target:
+    types:
+      - opened
+      - edited
+      - synchronize
 
 jobs:
   process:

parquet/README.md

@@ -82,7 +82,7 @@ version is available. Then simply update version of `parquet-format` crate in Ca
   - [x] Primitive column value readers
   - [x] Row record reader
   - [x] Arrow record reader
-- [ ] Statistics support
+- [x] Statistics support
 - [x] Write support
   - [x] Primitive column value writers
   - [ ] Row record writer