Support Julia v1.6

[dlfivefifty]

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[codecov]

Codecov Report

Merging #133 (e5067a0) into master (ba9dba0) will increase coverage by 4.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #133      +/-   ##
==========================================
+ Coverage   91.29%   95.53%   +4.23%     
==========================================
  Files           4        4              
  Lines         471      515      +44     
==========================================
+ Hits          430      492      +62     
+ Misses         41       23      -18     

Impacted Files	Coverage Δ
src/FillArrays.jl	94.13% <100.00%> (+2.34%)	⬆️
src/fillalgebra.jl	99.26% <0.00%> (+0.07%)	⬆️
src/trues.jl	83.33% <0.00%> (+3.33%)	⬆️
src/fillbroadcast.jl	96.10% <0.00%> (+18.96%)	⬆️

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