fix : minor issues fixed.

samila/functions.py

@@ -131,7 +131,7 @@ def save_data_file(data1, data2, file_adr):
     data['data2'] = data2
     result = {"status": True, "message": DATA_SAVE_SUCCESS_MESSAGE}
     try:
-        with open(file_adr, 'wb') as fp:
+        with open(file_adr, 'w') as fp:
             json.dump(data, fp)
     except Exception as e:
         result["status"] = False

samila/genimage.py

@@ -144,7 +144,7 @@ class GenerativeImage:
         """
         return save_fig_file(figure=self.fig, file_adr=file_adr, depth=depth)
 
-    def save_data(self, file_adr):
+    def save_data(self, file_adr='data.json'):
         """
         Save datas into a file.