Merge pull request #95 from leakingtapan/readme

Update README

docs/README.md

@@ -2,8 +2,6 @@
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-**NOTE**: This driver is currently in Beta release and should not be used in performance critical applications.
-
 ## Amazon EFS CSI Driver
 
 The [Amazon Elastic File System](https://aws.amazon.com/efs/) Container Storage Interface (CSI) Driver implements the [CSI](https://github.com/container-storage-interface/spec/blob/master/spec.md) specification for container orchestrators to manage the lifecycle of Amazon EFS filesystems.