#412: merge

Author: yegor256

Gemfile.lock

@@ -100,7 +100,7 @@ GEM
     i18n (1.14.6)
       concurrent-ruby (~> 1.0)
     iri (0.8.0)
-    json (2.9.0)
+    json (2.9.1)
     judges (0.27.0)
       backtrace (~> 0)
       baza.rb (~> 0)