Feat: Add version info 

**Is your feature request related to a problem? Please describe.**
There are no flags for sub-renamer to get version info

**Describe the solution you'd like**
Add version info and use `-v` to display the version 

**Why is the feature needed?**
This can tell users the app version they are using 

**Example**
```sh
$ sub-renamer -v
version v0.1.1
```