fix an error in line 47,change the word 'tables' to 'table' (#4358)

* add a new version to it

upgrade the version of it

* find an error in line 47,update README.md

find an error in line 47 of README.md,the word 'tables' should be changed to 'table'

* Removing trailing space to pass lint

stable/percona/Chart.yaml

@@ -1,5 +1,5 @@
 name: percona
-version: 0.3.0
+version: 0.3.1
 description: free, fully compatible, enhanced, open source drop-in replacement for
   MySQL
 keywords:

stable/percona/README.md

@@ -44,7 +44,7 @@ The command removes all the Kubernetes components associated with the chart and
 
 ## Configuration
 
-The following tables lists the configurable parameters of the Percona chart and their default values.
+The following table lists the configurable parameters of the Percona chart and their default values.
 
 | Parameter                  | Description                        | Default                                                    |
 | -----------------------    | ---------------------------------- | ---------------------------------------------------------- |

stable/percona/values.yaml

@@ -37,7 +37,7 @@ persistence:
   ##   set, choosing the default provisioner.  (gp2 on AWS, standard on
   ##   GKE, AWS & OpenStack)
   ##
-  # storageClass: "-" 
+  # storageClass: "-"
   accessMode: ReadWriteOnce
   size: 8Gi