Update .travis.yml

Co-Authored-By: Dale Wijnand <[email protected]>

Author: eed3si9n

.travis.yml

@@ -29,7 +29,7 @@ matrix:
 
 before_install:
   # adding $HOME/.sdkman to cache would create an empty directory, which interferes with the initial installation
-  - "[[ -d /home/travis/.sdkman/ ]] && [[ -d /home/travis/.sdkman/bin/ ]] || rm -rf /home/travis/.sdkman/"
+  - "[[ -d "$HOME/.sdkman/bin" ]] || rm -rf "$HOME/.sdkman/"
   - curl -sL https://get.sdkman.io | bash
   - echo sdkman_auto_answer=true > /home/travis/.sdkman/etc/config
   - source "/home/travis/.sdkman/bin/sdkman-init.sh"