Fully drop 0.7 support.

[tkoolen]

Needed because of ambiguities with deprecated methods on 0.7:

 (any(f::F, tsc::TypeSortedCollection{#s16,N} where #s16) where {F, N} in TypeSortedCollections at /home/twan/.julia/dev/TypeSortedCollections/src/TypeSortedCollections.jl:224, any(a::AbstractArray, dims) in Base at deprecated.jl:53)
 (all(f::F, tsc::TypeSortedCollection{#s16,N} where #s16) where {F, N} in TypeSortedCollections at /home/twan/.julia/dev/TypeSortedCollections/src/TypeSortedCollections.jl:244, all(a::AbstractArray, dims) in Base at deprecated.jl:53)

Also lose Compat dependency.

[codecov]

Codecov Report

Merging #38 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #38   +/-   ##
=======================================
  Coverage   98.33%   98.33%           
=======================================
  Files           1        1           
  Lines         120      120           
=======================================
  Hits          118      118           
  Misses          2        2

Impacted Files	Coverage Δ
src/TypeSortedCollections.jl	98.33% <ø> (ø)	⬆️

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