Fix absolute path needed in the run script example

In my case, this doesn't work:
```
$ extract-messages -l=en,ja -o app/translations -d en --flat false 'app/**/!(*.test).js'
```
But it works if i provide absolute path to input files regex:
```
$ extract-messages -l=en,ja -o app/translations -d en --flat false './app/**/!(*.test).js'
```

Author: revskill10

readme.md

@@ -51,7 +51,7 @@ export const SubmitButton = () => {
 ### Run Script
 
 ```
-$ extract-messages -l=en,ja -o app/translations -d en --flat false 'app/**/!(*.test).js'
+$ extract-messages -l=en,ja -o app/translations -d en --flat false './app/**/!(*.test).js'
 ```
 
 ### Output