[CI] Correct wrong json msg buffer size on bin (#519)

#518

* [CI] with pio we are now able to use directly user_config.h, align test_config.h

.travis.yml

@@ -34,11 +34,8 @@ matrix:
       install:
         - pip install -U platformio
         - platformio update
-        - rm /home/travis/build/1technophile/OpenMQTTGateway/main/User_config.h
-        - cp /home/travis/build/1technophile/OpenMQTTGateway/test/Test_config.h /home/travis/build/1technophile/OpenMQTTGateway/main//User_config.h
       script: 
         - sed -i 's/version_tag/'$TRAVIS_TAG'/g' main/User_config.h
-        - sed -i 's/version_tag/'$TRAVIS_TAG'/g' test/Test_config.h
         - platformio run
         - bash scripts/prepare_deploy.sh
       before_deploy: ls -a