version: bump to 0.12.0

rev'ing a Y stream version because this release only has the change of
making the forked version of `archive/tar` now an internal library.

Since tar-split is not even using _all_ the logic in these libraries,
might as well limit folks ability to import from this aging code.

Reference: #79

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

Author: vbatts

cmd/tar-split/main.go

@@ -7,7 +7,7 @@ import (
 	"github.com/urfave/cli"
 )
 
-var Version = "v0.11.7"
+var Version = "v0.12.0"
 
 func main() {
 	app := cli.NewApp()