Travis fixed warnings configuration TRAVIS_FORCE_BUILD

.travis.yml

@@ -164,8 +164,7 @@ script:
         else
           # build sketch
           echo -e "\n\033[1;33mBuilding ${example##*/} ... \033[0m";
-          # arduino --verify --warnings=$WARNINGS --board $BOARD $example;
-          arduino-cli compile --fqbn $BOARD $example --warnings=all
+          arduino-cli compile --fqbn $BOARD $example --warnings=$WARNINGS
           if [ $? -ne 0 ]; then
             echo -e "\033[1;31m${example##*/} build FAILED\033[0m\n";
             exit 1;