Fix bug in comparing the return value of `require_once()`

See https://github.com/websharks/quick-cache/commit/d501814a0a59d65b4dbd2d9b7fca1e42eef18192#commitcomment-8846488
Releasing Quick Cache v141205
Merge branch 'release/141205'
Merge tag '141205' into 000000-dev

Tagging 141205