add version command

cmd/version.go

@@ -0,0 +1,20 @@
+package cmd
+
+import (
+	"github.com/deviceinsight/kafkactl/output"
+	"github.com/spf13/cobra"
+)
+
+const VERSION = "0.0.1"
+
+var cmdVersion = &cobra.Command{
+	Use:   "version",
+	Short: "print the version of kafkactl",
+	Run: func(cmd *cobra.Command, args []string) {
+		output.Infof(VERSION)
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(cmdVersion)
+}

create_release.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+version=$1
+
+if [ "$version" == "" ]; then
+  echo "enter release version:"
+  read version
+fi
+
+version_go="cmd/version.go"
+
+echo "updating $version_go to version $version..."
+eval "sed -i 's/const VERSION = .*/const VERSION = \"$version\"/g' $version_go"
+echo "done"