[algorithm] Read and decode from file before loading json

beat/backend/python/algorithm.py

@@ -356,7 +356,7 @@ class Algorithm(object):
             return
 
         with open(json_path, 'rb') as f:
-            self.data = simplejson.load(f)
+            self.data = simplejson.loads(f.read().decode('utf-8'))
 
         self.code_path = self.storage.code.path
         self.code = self.storage.code.load()