fix error under Python3.6

Author: supercoderhawk

pysenal/utils/utils.py

@@ -121,11 +121,7 @@ def json_serialize(obj):
     :return: string representation for json.dump or json.dumps
     """
     if isinstance(obj, Decimal):
-        numerator, denumerator = obj.as_integer_ratio()
-        if denumerator == 1:
-            return str(numerator)
-        else:
-            return str(obj)
+        return str(obj)
     elif isinstance(obj, bytes):
         return str(obj)
     else:

tests/utils/test_utils.py

@@ -109,6 +109,6 @@ def test_index():
 
 def test_json_serialize():
     assert json_serialize(Decimal('3.1415926')) == '3.1415926'
-    assert json_serialize(Decimal('11.0')) == '11'
+    assert json_serialize(Decimal('11.0')) == '11.0'
     assert json_serialize(b'123') == "b'123'"
     assert json_serialize(11) == '11'