cmd/operator-sdk/main.go: remove --version flag (#1444)

* cmd/operator-sdk/main.go: remove --version flag

Author: joelanford

CHANGELOG.md

@@ -26,6 +26,7 @@
 ### Removed
 
 - The SDK will no longer run `defaulter-gen` on running `operator-sdk generate k8s`. Defaulting for CRDs should be handled with mutating admission webhooks. ([#1288](https://github.com/operator-framework/operator-sdk/pull/1288))
+- The `--version` flag was removed. Users should use the `operator-sdk version` command. ([#1444](https://github.com/operator-framework/operator-sdk/pull/1444))
 - **Breaking Change**: The `test cluster` subcommand and the corresponding `--enable-tests` flag for the `build` subcommand have been removed ([#1414](https://github.com/operator-framework/operator-sdk/pull/1414))
 - **Breaking Change**: The `--cluster-scoped` flag for `operator-sdk new` has been removed so it won't scaffold a cluster-scoped operator. Read the [operator scope](https://github.com/operator-framework/operator-sdk/blob/master/doc/operator-scope.md) documentation on the changes needed to run a cluster-scoped operator. ([#1434](https://github.com/operator-framework/operator-sdk/pull/1434))
 

cmd/operator-sdk/main.go

@@ -34,7 +34,6 @@ import (
 	"github.com/operator-framework/operator-sdk/cmd/operator-sdk/up"
 	"github.com/operator-framework/operator-sdk/cmd/operator-sdk/version"
 	flags "github.com/operator-framework/operator-sdk/internal/pkg/flags"
-	osdkversion "github.com/operator-framework/operator-sdk/version"
 
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
@@ -44,9 +43,8 @@ import (
 
 func main() {
 	root := &cobra.Command{
-		Use:     "operator-sdk",
-		Short:   "An SDK for building operators with ease",
-		Version: osdkversion.Version,
+		Use:   "operator-sdk",
+		Short: "An SDK for building operators with ease",
 		PersistentPreRun: func(cmd *cobra.Command, args []string) {
 			if viper.GetBool(flags.VerboseOpt) {
 				err := projutil.SetGoVerbose()