Remove all reference of Virtus (#249)

It was removed in Grape 1.3: ruby-grape/grape#1920 / https://github.com/ruby-grape/grape/blob/master/UPGRADING.md#upgrading-to--130 I'm not sure this particular constant definition is useful anyway.
sorbet · May 26, 2020 · 9e2ff71 · 9e2ff71
1 parent 7c5dfbc
commit 9e2ff71
Showing 1 changed file with 0 additions and 5 deletions.
diff --git a/lib/grape/all/grape.rbi b/lib/grape/all/grape.rbi
@@ -1,11 +1,6 @@
 # typed: strong
 
-class Virtus::Attribute::Boolean
-end
-
 class Grape::API
-  Boolean = Virtus::Attribute::Boolean
-
   sig do
     params(
       name: Symbol,