Add a missing release process to update ASF's report database (#318)

fix #311
diff --git a/dev/release/README.md b/dev/release/README.md
index f8eed21..56aa001 100644
--- a/dev/release/README.md
+++ b/dev/release/README.md
@@ -87,6 +87,8 @@
 $ dev/release/release.sh 2.2.1 1
 ```
 
+Add the release to ASF's report database via [Apache Committee Report Helper](https://reporter.apache.org/addrelease.html?arrow).
+
 To publish the release to the Julia General registry, navigate to the GitHub commit where the project version was incremented in the Project.toml file (step 2 above), then post a comment on the commit with the following:
 
 `@JuliaRegistrator register()`
diff --git a/dev/release/release.sh b/dev/release/release.sh
index 352f60d..b597962 100755
--- a/dev/release/release.sh
+++ b/dev/release/release.sh
@@ -68,3 +68,6 @@
 
 echo "Success! The release is available here:"
 echo "  https://dist.apache.org/repos/dist/release/arrow/${release_id}"
+echo
+echo "Add this release to ASF's report database:"
+echo "  https://reporter.apache.org/addrelease.html?arrow"