chore: unset UPTIMEROBOT_APIKEY env variable to workaround an error during deploy.

Temporary workaround for #1089

Author: php-coder

.travis.yml

@@ -8,7 +8,7 @@ env:
     - SPRING_PROFILES_ACTIVE=travis
   global:
     - MAVEN_OPTS='-Xss256k'
-    - secure: "fBav56BzY+A+Vs1g9YSfo1oLDCO1rFrXl49lJkOA5/XpnsKEEs4lI2RcOzz0wiJKXFNgcliiAJWoYMI8Esqz+lkyFWan4ij5Co0UzJcytDuY+2o+jaqwx45DuDYPogABzT+hWjLCxQLLG46gUkChzT8kcvOOn6JxC7Ff8q5MnoM="
+   #- secure: "fBav56BzY+A+Vs1g9YSfo1oLDCO1rFrXl49lJkOA5/XpnsKEEs4lI2RcOzz0wiJKXFNgcliiAJWoYMI8Esqz+lkyFWan4ij5Co0UzJcytDuY+2o+jaqwx45DuDYPogABzT+hWjLCxQLLG46gUkChzT8kcvOOn6JxC7Ff8q5MnoM="
 
 before_script:
   - if [ "$SPRING_PROFILES_ACTIVE" = 'travis' ]; then