Print names of output files if it's not the name given for `--out`

[ispringer]

$ quicktype --version
quicktype version 15.0.158
$ cat foo.ts
interface Tester {
    name: string;
}
$ quicktype foo.ts -o foo.java --debug
Error: Cannot read property 'split' of null.
$ echo $?
1
$ cat foo.java
cat: foo.java: No such file or directory

[schani]

The --debug option takes an argument, and we're not handling the case where it's missing.

Furthermore, Java will produce files named after the classes, so if you remove the --debug option you should end up with a Tester.java file. Can you confirm that?

[ispringer]

Yes, Tester.java gets created. I didn't notice that before, because I was looking for foo.java. It would be helpful if it printed the name of the output file in the case where it is not the same as the filename specified via -o.