mockolo: Use language-specific heredocs

Author: issyl0

Formula/m/mockolo.rb

@@ -30,16 +30,16 @@ def install
   end
 
   test do
-    (testpath/"testfile.swift").write <<~EOS
+    (testpath/"testfile.swift").write <<~SWIFT
       /// @mockable
       public protocol Foo {
           var num: Int { get set }
           func bar(arg: Float) -> String
       }
-    EOS
+    SWIFT
     system bin/"mockolo", "-srcs", testpath/"testfile.swift", "-d", testpath/"GeneratedMocks.swift"
     assert_predicate testpath/"GeneratedMocks.swift", :exist?
-    output = <<~EOS.gsub(/\s+/, "").strip
+    output = <<~SWIFT.gsub(/\s+/, "").strip
       ///
       /// @Generated by Mockolo
       ///
@@ -62,7 +62,7 @@ def install
             return ""
         }
       }
-    EOS
+    SWIFT
     assert_equal output, shell_output("cat #{testpath/"GeneratedMocks.swift"}").gsub(/\s+/, "").strip
   end
 end