bartycrouch: Use language-specific heredocs

Author: issyl0

Formula/b/bartycrouch.rb

@@ -25,15 +25,15 @@ def install
   end
 
   test do
-    (testpath/"Test.swift").write <<~EOS
+    (testpath/"Test.swift").write <<~SWIFT
       import Foundation
 
       class Test {
         func test() {
             NSLocalizedString("test", comment: "")
         }
       }
-    EOS
+    SWIFT
 
     (testpath/"en.lproj/Localizable.strings").write <<~EOS
       /* No comment provided by engineer. */