Remove EllipsisNotation.jl

[mcabbott]

This reverts #57, making the package depend only on the standard library.

[codecov]

Codecov Report

Merging #83 (8b3bc51) into master (e73b682) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #83   +/-   ##
=======================================
  Coverage   90.94%   90.94%           
=======================================
  Files           3        3           
  Lines         265      265           
=======================================
  Hits          241      241           
  Misses         24       24           

Impacted Files	Coverage Δ
src/IntervalSets.jl	82.03% <ø> (ø)
src/interval.jl	99.08% <100.00%> (ø)

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[mcabbott]

Bump?

[timholy]

Seems reasonable. This will definitely be breaking though.