Modified change method of priority queue interfaces and classes to return boolean #54
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Summary
Modified the change method of the PriorityQueue, PriorityQueueDouble, IntPriorityQueue, IntPriorityQueueDouble interfaces, and of the classes that implement them to now return a boolean. This is technically a breaking change, but not going to increment major release number because these interfaces were just introduced, and I believe my own projects are the only ones using this library at the present time, and even those haven't upgraded to the version where these interfaces were introduced. Additionally, it is only a breaking change if someone is implementing the interfaces. If they are simply using the library's implementations, then the change of return type from void to boolean will have no effect on code using the implementations.
Closing Issues
Closes #48
Types of changes