added the parital and case_sensitive function in the doc

Author: DagaBhai

src/jsonparse/functions.py

@@ -16,6 +16,13 @@ def find_key(data, key):
     data -- The python object representing JSON data with key:value pairs. This could be a dictionary or a list.
 
     key  -- The key that will be searched for in the JSON data. The key must be a string.
+
+    partial -- If set to True the search will perform a partial match on keys 
+               This means the provided key may appear as a substring of the dictionary key
+               Default is False which results in exact key matches will be returned
+    
+    case_sensitive -- If set to True the key comparison will be case-sensitive
+                      Default is False which means 'Name' and 'name'  will be considered same
     """
     return Parser().find_key(data, key)