Add support for "suggested change"

[nedtwigg]

Spotless is a code autoformatter for many languages, and someone suggested adding support for violations-lib.

It would be awesome if violations-lib also supported suggested changes. If it did, then Spotless' console output could provide comments not only on which lines have format problems, but also on what they need to be changed to.

[tomasbjerre]

Sounds good. If so I would need a sample report to use for testning. Or you file a PR.

I also replied in you issue at Spotless.

[nedtwigg]

Google's errorprone can generate a standard unified diff patch file. We can't do it currently, but we could pretty easily build to that spec.

[tomasbjerre]

Ok!

Should be possible with severity and message being hard coded to something.

violations-lib/src/main/java/se/bjurr/violations/lib/model/Violation.java

Line 167 in 1680f68

public Violation(final ViolationBuilder vb) {

I am parsing a patch in a library using this library. Perhaps it should be moved to this library.
https://github.com/tomasbjerre/violation-comments-lib/blob/master/src/main/java/se/bjurr/violations/comments/lib/PatchParser.java