uwsgi: Use language-specific heredocs

Author: issyl0

Formula/u/uwsgi.rb

@@ -91,11 +91,11 @@ def install
   end
 
   test do
-    (testpath/"helloworld.py").write <<~EOS
+    (testpath/"helloworld.py").write <<~PYTHON
       def application(env, start_response):
         start_response('200 OK', [('Content-Type','text/html')])
         return [b"Hello World"]
-    EOS
+    PYTHON
 
     port = free_port