[algorithm] Use simplejson

No need for version detection in this case

beat/core/algorithm.py

@@ -49,10 +49,9 @@ Forward importing from :py:mod:`beat.backend.python.algorithm`
 
 import os
 import six
-import sys
-import json
 import numpy
 import pkg_resources
+import simplejson as json
 
 from . import dataformat
 from . import library
@@ -69,9 +68,6 @@ def load_algorithm_prototype(prefix):
     prototype_data = pkg_resources.resource_string(
         __name__, "prototypes/algorithm.json"
     )
-    if sys.version_info < (3, 6):
-        prototype_data = prototype_data.decode("utf-8")
-
     algorithm_data = json.loads(prototype_data)
     ref_dataformats = ["integer", "integers"]
     dataformat = None