README.md: Remove strike through

[#182736568](https://www.pivotaltracker.com/story/show/182736568)

Co-authored-by: Kyle Ong <[email protected]>
Co-authored-by: Andrew Garner <[email protected]>

Author: ohkyle

README.md

@@ -1,6 +1,6 @@
 # pxc-release
 
-Percona Xtradb Cluster release ~~**Only for limited production use**~~
+Percona Xtradb Cluster release
 
 pxc-release is a BOSH release of MySQL Galera that can be used as a backing store for Cloudfoundry. The Galera Cluster Provider is [Percona Xtradb Cluster](https://www.percona.com/software/mysql-database/percona-xtradb-cluster).
 This release is intended as a drop-in replacement for [cf-mysql-release](https://github.com/cloudfoundry/cf-mysql-release).