must use tag,not support dev-master?

```
not support:
"require": {
"xxx": "dev-master"
}

ok:
"require": {
"xxx": "1.0"
}

```

Start by reproducing the reported difference between a Composer requirement using "dev-master" and one using "1.0" in Satis. Read the issue discussion and trace how Satis handles these package constraints; done means the supported behavior is established and the reported case is fixed or clearly documented.

Written by the indexing model from the issue text.