The Lint/Eval cop has been renamed to Security/Eval by rubocop

aerostitch · aerostitch · commit 3993b2da1ef5 · 2017-01-24T17:14:36.000-08:00
diff --git a/skeleton/.rubocop.yml b/skeleton/.rubocop.yml
@@ -72,7 +72,7 @@ Lint/AmbiguousRegexpLiteral:
   Enabled: false
 
 # DISABLED
-Lint/Eval:
+Security/Eval:
   Enabled: false
 
 # DISABLED
