fix deprecations on 0.7 and support 0.6

[KristofferC]

No description provided.

[codecov-io]

Codecov Report

Merging #46 into master will decrease coverage by 0.31%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
- Coverage   94.02%   93.71%   -0.32%     
==========================================
  Files          14       14              
  Lines         519      509      -10     
==========================================
- Hits          488      477      -11     
- Misses         31       32       +1

Impacted Files	Coverage Δ
src/hyperrectangles.jl	69.23% <ø> (ø)	⬆️
src/NearestNeighbors.jl	66.66% <ø> (-16.67%)	⬇️
src/datafreetree.jl	82.14% <ø> (ø)	⬆️
src/ball_tree.jl	100% <ø> (ø)	⬆️
src/brute_tree.jl	100% <ø> (ø)	⬆️
src/hyperspheres.jl	100% <ø> (ø)	⬆️
src/kd_tree.jl	100% <ø> (ø)	⬆️
src/tree_data.jl	100% <ø> (ø)	⬆️

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