fixed OneClassPerFileFixer with ::class
minor #383 fixed OneClassPerFileFixer with ::class (sstok)

This PR was merged into the 0.5.x-dev branch.

Discussion
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fixed OneClassPerFileFixer with ::class

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #377
| License       | MIT

Commits
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08ce9ab fixed OneClassPerFileFixer with ::class