The since Tag check for inner classes

[dgarus]

Currently, if an inner class doesn't have the tag "since" then we get the error like this:

[INFO] Checkstyle: C:\.....\jpeek\src\main\java\org\jpeek\Base.java[46]: Missing '@since' tag in class/interface comment (JavadocTagsCheck)

I think the tag "since" shouldn't be mandatory for inner classes.

[0crat]

@krzyk/z please, pay attention to this issue

[0crat]

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