Change years of files for copyright

[timur-harin]

@yegor256
Studying the details of the project, I noticed that despite the fact that a check for years in the file copyright was added, there were still files with incorrect copyright, I suggest that you fix it

Original issue #189 and fix from PR #305

[yegor256]

@timur-harin why the check is not catching these errors? Maybe we should also fix the check, in this PR?

[timur-harin]

@yegor256
Could I make it in separate PR?

Because you told us:
"My recommendation to you: make smaller PRs! Think about their total count, not about their value"

[yegor256]

@timur-harin that's correct, but this PR doesn't make sense: we don't fix the problem.

[timur-harin]

@yegor256
I solved this issue, it was because .java and .xml files were not in search by extensions
Now I added them and also avoid these folders:

• test-zone - because here are not source code files
• unparseable - because you are not the author of java files inside

[yegor256]

@timur-harin thanks!