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Update README.md 

Hi! As a first-time user of your great package I got a little bit confused on using command line args and env vars together, so it took me some time to make testing and I propose to save this time for other people by adding relevant edits to README.md
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evgenv123 2021-09-18 22:23:26 +07:00 committed by GitHub
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@ -158,6 +158,19 @@ var args struct {
arg.MustParse(&args) arg.MustParse(&args)
``` ```
### Priority
You can use both command line arguments and environmental variables at the same time.
The priority is as follows: <b>command line arguments</b> -> if empty we check <b>environmental variables</b> -> and then we use <b>default values</b>
```go
var args struct {
Command string `arg:"-c,env:COMMAND" help:"Command to execute" default:"remove"`
File string `arg:"-f,env:FILE_NAME"`
}
arg.MustParse(&args)
```
### Default values (before v1.2) ### Default values (before v1.2)
```go ```go