Fix cache key not depending on chosen_algorithm (#54)

flask_compress/flask_compress.py

@@ -179,7 +179,7 @@ def after_request(self, response):
         response.direct_passthrough = False
 
         if self.cache is not None:
-            key = self.cache_key(request)
+            key = (chosen_algorithm, self.cache_key(request))
             compressed_content = self.cache.get(key)
             if compressed_content is None:
                 compressed_content = self.compress(app, response, chosen_algorithm)