Bump requirements to julia-0.7

[timholy]

To trigger femtocleaner

[cormullion]

the removal of Compat seems to cause errors

[SimonDanisch]

Took the freedom to fix the functionality relying on Compat. Luckily it was just vectorize_arg. Pretty sure that the vectorize(1/2)_arg isn't needed anymore with broadcast! Tests pass locally when removing them, so if it was needed, it wasn't even receiving any test coverage.

[codecov-io]

Codecov Report

Merging #87 into master will increase coverage by 10.86%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master      #87       +/-   ##
===========================================
+ Coverage   85.71%   96.58%   +10.86%     
===========================================
  Files           1        1               
  Lines         175      117       -58     
===========================================
- Hits          150      113       -37     
+ Misses         25        4       -21

Impacted Files	Coverage Δ
src/ColorVectorSpace.jl	96.58% <100%> (+10.86%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ae92d14...1104a12. Read the comment docs.

[SimonDanisch]

any veto on a quick merge + tag?! @timholy

[timholy]

It still has a heck of a lot of depwarns, and I was thinking we'd want to get rid of those first? I got rid of some in ColorTypes and more in my latest commit. But the new stdlib Statistics is going to wreak temporary havoc. We may need to wait for StatsBase to release a new version to really know if they are gone 😦.

But I suppose we could tag now if this passes.

[timholy]

Looks like 64bit windows is behind in the buildbots, but the minimum julia version should take care of that. All others passed. Because I'm reasonably confident that all the remaining depwarns need fixing outside this package, I'll merge.