minor typo error in FileCache.java

[Hivenfour]

at Granule / tag-main / src / com / granule / cache / FileCache.java
https://github.com/JonathanWalsh/Granule/blob/5f185d4896d79ff8033162ae2b478324b31fcfd7/tag-main/src/com/granule/cache/FileCache.java
line 166:

logger.warn("Rebuilding from dublicate id");

"dublicate" should be "duplicate"