bugfix android receiving plain boolean values

[Frank608]

Describe the bug
An Error (JSON Exception) is thrown when receiving plain boolean values from endpoints on android

To Reproduce
Steps to reproduce the behavior:

1. receive plain boolean value from REST-Endpoint

Expected behavior
Boolean should be converted to JSON object

Screenshots
If applicable, add screenshots to help explain your problem.

Smartphone (please complete the following information):

• Device: Samsung Galaxy A50
• OS: Android 11

Additional context
#90

[thomasvidas]

Fixed in #145