Update yard

tbuehlmann · tbuehlmann · commit ffd99a3b9e39 · 2019-07-18T14:01:57.000+02:00
diff --git a/Gemfile.lock b/Gemfile.lock
@@ -50,7 +50,7 @@ GEM
     thread_safe (0.3.6)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    yard (0.9.12)
+    yard (0.9.20)
     zeitwerk (2.1.9)
 
 PLATFORMS
