Changed license to look for .txt or .md :)

Author: Matt Bernier

test/test_ruby_http_client.rb

@@ -213,7 +213,7 @@ def test_issue_template_exists
   end
 
   def test_license_exists
-    assert(File.file?('./LICENSE.md'))
+    assert(File.file?('./LICENSE.md') || File.file?('./LICENSE.txt'))
   end
 
   def test_pull_request_template_exists