get rid of methods without interfaces

See #99, release log:

• 708343a by @eg04lt3r: Merge remote-tracking branch '...
• 35e4627 by @eg04lt3r: Merge branch 'master' of https...
• 1b1e1cb by @eg04lt3r: Merge branch 'master' of https...

Released by Rultor 1.52, see build log