Now the output would be:
```
 ./coredns -version
CoreDNS-010
linux/amd64, go1.8, 241e3dbc
```
In case the local file has been modified, then the output would be (with --dirty):
```
 ./coredns -version
CoreDNS-010
linux/amd64, go1.8, 241e3dbc-dirty
```
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>