Simplify Version command

[itsksaurabh]

Currently, The version of the cmd tool is set using an additional function which can be seen here.

The Cobra Library already has a feature to set the version using the underlying struct field Version.

// Version defines the version for this command. If this value is non-empty and the command does not
// define a "version" flag, a "version" boolean flag will be added to the command and, if specified,
// will print content of the "Version" variable. A shorthand "v" flag will also be added if the
// command does not define one.

    Version string

Official docs: https://github.com/spf13/cobra/blob/5cdf8e26ba7046dd743463f60102ab52602c6428/command.go#L90

My proposal to improve it :

	// RootCmd steals and anonymises databases
	RootCmd = &cobra.Command{
		Use:     "klepto",
		Version: version,  <======== Sets the version 
         .......
        ..................
}

I have already tested it and working as expected. Please check the output below:

$ ./testklepto --version
klepto version 0.0.0-dev