Pass request data dict as json arg, not data arg

`requests.post` data argument is used to send that in the **body** request,
not as json header.
The json argument can be a dictionary and doesn't need to be converted to
string.

pygnunetrest/gnunetrest.py

@@ -51,7 +51,7 @@ class GNUnetRest:
 
     def create_identity(self, identity_name):
         """Creates Identy, returns True if successful, tuple if not."""
-        r = requests.post(self.identity, {"name": identity_name})
+        r = requests.post(self.identity, json={"name": identity_name})
         return r.ok if r.ok else (False, r.reason)
 
     def change_identity_name(self, identity_name, new_identity_name):
@@ -62,7 +62,7 @@ class GNUnetRest:
         """
         r = requests.put(
             self.identity_name + identity_name,
-            {"newname": new_identity_name}
+            json={"newname": new_identity_name}
         )
         return True if r.ok else (False, r.reason)
 
@@ -81,7 +81,7 @@ class GNUnetRest:
         """
         r = requests.put(
             self.identity_subsystem + identity_name,
-            {"subsystem": "namestore"})
+            json={"subsystem": "namestore"})
         return True if r.ok else (False, r.reason)
 
     def list_namestore_entries(self, zone):
@@ -91,18 +91,20 @@ class GNUnetRest:
 
     def add_namestore_entry(self, zone, record_name, value, record_type):
         """Adds a namestore entry, returns true if successful, tuple if not."""
-
-        data = {
-            'value': value,
-            'record_type': record_type,
+        # It needs to send all flags, otherwise it'd return 500.
+        entry = {
             'record_name': record_name,
-            "expiration_time": "1d",
-            "private": False,
-            "relative_expiration": False,
-            "supplemental": False,
-            "shadow": False,
+            'data': [{
+                'value': value,
+                'record_type': record_type,
+                "expiration_time": "1d",
+                "private": False,
+                "relative_expiration": False,
+                "supplemental": False,
+                "shadow": False,
+            }]
         }
-        r = requests.post(self.namestore + zone, data)
+        r = requests.post(self.namestore + zone, json=entry)
         return True if r.ok else (False, r.reason)
 
     def change_namestore_entry(self, zone, record_name, value, record_type):
@@ -111,12 +113,19 @@ class GNUnetRest:
         returns true if successful, tuple if not.
 
         """
-        data = {
-            'value': value,
-            'record_type': record_type,
+        entry = {
             'record_name': record_name,
+            'data': [{
+                'value': value,
+                'record_type': record_type,
+                "expiration_time": "1d",
+                "private": False,
+                "relative_expiration": False,
+                "supplemental": False,
+                "shadow": False,
+            }]
         }
-        r = requests.put(self.namestore + zone, data)
+        r = requests.put(self.namestore + zone, json=entry)
         return True if r.ok else (False, r.reason)
 
     def delete_namestore_entry(self, zone, record_name):