Remove unicode from example formula

Library/Contributions/example-formula.rb

@@ -396,10 +396,10 @@ class ExampleFormula < Formula
 
     # Need complete control over stdin, stdout?
     require "open3"
-    Open3.popen3("#{bin}/example", "big5:utf-8") do |stdin, stdout, _|
-      stdin.write("\263\134\245\134\273\134")
+    Open3.popen3("#{bin}/example", "argument") do |stdin, stdout, _|
+      stdin.write("some text")
       stdin.close
-      assert_equal "許功蓋", stdout.read
+      assert_equal "result", stdout.read
     end
 
     # If an exception is raised (e.g. by assert), or if we return false, or if