Fix deprecations

[femtocleaner[bot]]

I fixed a number of deprecations for you

[timholy]

Hmm, I thought I had to trigger this manually. Once it gets through CI, any objections to merging this? It might cause merge conflicts elsewhere, of course.

[codecov[bot]]

Codecov Report

Merging #12 into master will increase coverage by 0.22%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
+ Coverage   99.09%   99.32%   +0.22%     
==========================================
  Files           7        7              
  Lines         444      443       -1     
==========================================
  Hits          440      440              
+ Misses          4        3       -1

Impacted Files	Coverage Δ
src/core.jl	100% <ø> (ø)	:arrow_up:
src/felzenszwalb.jl	100% <ø> (ø)	:arrow_up:
src/fast_scanning.jl	100% <100%> (+1.51%)	:arrow_up:
src/region_growing.jl	100% <100%> (ø)	:arrow_up:
src/watershed.jl	97.5% <100%> (ø)	:arrow_up:

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[Keno]

Hmm, I thought I had to trigger this manually

It gets triggered once upon installation and then every time you update REQUIRE to include a new julia version (though it won't open a PR if there's no changes to be made).

[annimesh2809]

No objections from my side.