fix json

Author: Phil Varner

README.md

@@ -258,15 +258,15 @@ Example:
                         "value_as_type" : 8644819
                     },
                     {
-                        "key": "2001-01-01T00:00:00.000Z,
+                        "key": "2001-01-01T00:00:00.000Z",
                         "key_as_type": 978307200000,
                         "from": 5,
                         "to": 10,
                         "value" : "5644819",
                         "value_as_type" : 5644819
                     },
                     {
-                        "key": "2002-01-01T00:00:00.000Z,
+                        "key": "2002-01-01T00:00:00.000Z",
                         "key_as_type": 1009843200000,
                         "from": 10,
                         "value" : "7644819",