Fixed compilation error

I was getting this error when compiling with maven 3 and jdk 1.6_37;

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (default-compile) on project redreader: Compilation failure: Compilation failure:
[ERROR] /Users/edmundd/Projects/RedReader/src/main/java/org/quantumbadger/redreader/cache/PrioritisedDownloadQueue.java:[112,19] java.util.HashMap.Entry is not public in java.util.HashMap; cannot be accessed from outside package
[ERROR] /Users/edmundd/Projects/RedReader/src/main/java/org/quantumbadger/redreader/cache/PrioritisedDownloadQueue.java:[134,19] java.util.HashMap.Entry is not public in java.util.HashMap; cannot be accessed from outside package