Address range validation difference for line number command

Gnu:
```
 $ echo -e "line1\nline2\nline3" | sed -e "47,60="
  line1
  line2
  line3
```

  with Rust:
```
  $ echo -e "line1\nline2\nline3" | ./target/debug/sed -e "47,60="
  sed: <script argument 1>:1:6: error: command = expects up to 1 address(es), found 2

```

Found with a fuzzer