Update PriorityQueue constructors (fixes #17)

[kmsquire]

• These were changed in a recent release of DataStructures

[codecov[bot]]

Codecov Report

Merging #19 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #19   +/-   ##
=======================================
  Coverage   98.23%   98.23%           
=======================================
  Files           9        9           
  Lines         511      511           
=======================================
  Hits          502      502           
  Misses          9        9

Impacted Files	Coverage Δ
src/watershed.jl	97.5% <100%> (ø)	:arrow_up:
src/region_growing.jl	100% <100%> (ø)	:arrow_up:

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[timholy]

Awesome, thanks so much!

I like how PriorityQueue can now have a "default parameter" for its ordering, expressed in the natural way. :+1: