Update installation.md

[codecov[bot]]

Codecov Report

Merging #288 (364bcae) into master (4e8b28c) will increase coverage by 0.60%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #288      +/-   ##
==========================================
+ Coverage   88.35%   88.96%   +0.60%     
==========================================
  Files          37       37              
  Lines        2912     3036     +124     
==========================================
+ Hits         2573     2701     +128     
+ Misses        339      335       -4     

Impacted Files	Coverage Δ
src/lphrep.jl	90.29% <0.00%> (-0.14%)	:arrow_down:
src/vecrep.jl	100.00% <0.00%> (ø)
src/triangulation.jl	100.00% <0.00%> (ø)
src/interval.jl	99.21% <0.00%> (+0.01%)	:arrow_up:
src/iterators.jl	99.23% <0.00%> (+0.03%)	:arrow_up:
src/liftedrep.jl	98.59% <0.00%> (+0.04%)	:arrow_up:
src/show.jl	98.52% <0.00%> (+0.06%)	:arrow_up:
src/default.jl	86.66% <0.00%> (+0.09%)	:arrow_up:
src/projection.jl	91.07% <0.00%> (+0.16%)	:arrow_up:
src/aff.jl	96.11% <0.00%> (+0.24%)	:arrow_up:
... and 16 more

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