README.md in fluent-plugin-gcloud-pubsub-custom-1.0.0 vs README.md in fluent-plugin-gcloud-pubsub-custom-1.0.1

@@ -17,10 +17,17 @@
 - Create a project on Google Developer Console
 - Add a topic of Cloud Pub/Sub to the project
 - Add a pull style subscription to the topic
 - Download your credential (json) or [set scope on GCE instance](https://cloud.google.com/compute/docs/api/how-tos/authorization)
 
+## Requirements
+
+| fluent-plugin-gcloud-pubsub-custom | fluentd | ruby |
+|------------------------|---------|------|
+| >= 1.0.0 | >= v0.14.0 | >= 2.1 |
+|  < 1.0.0 | >= v0.12.0 | >= 1.9 |
+
 ## Installation
 
 Install by gem:
 
 ```shell
@@ -122,12 +129,12 @@
 - `topic` (required)
   - Set topic name to pull.
 - `subscription` (required)
   - Set subscription name to pull.
 - `max_messages` (optional, default: `100`)
-  - See maxMessages on https://cloud.google.com/pubsub/subscriber#receiving-pull-messages
+  - See maxMessages on https://cloud.google.com/pubsub/docs/reference/rest/v1/projects.subscriptions/pull
 - `return_immediately` (optional, default: `true`)
-  - See returnImmediately on https://cloud.google.com/pubsub/subscriber#receiving-pull-messages
+  - See returnImmediately on https://cloud.google.com/pubsub/docs/reference/rest/v1/projects.subscriptions/pull
   - If `return_immediately` is `true` or pulling message is stopped by HTTP RPC, this plugin wait `pull_interval` each pull.
 - `pull_interval` (optional, default: `5.0`)
   - Pulling messages by intervals of specified seconds.
 - `pull_threads` (optional, default: `1`)
   - Set number of threads to pull messages.