CI: Drop v1.0 support, add nightly to tests

[NHDaly]

No description provided.

[codecov-commenter]

Codecov Report

Merging #44 (53c11a7) into master (7e2710d) will increase coverage by 1.40%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
+ Coverage   96.81%   98.22%   +1.40%     
==========================================
  Files           2        2              
  Lines         220      225       +5     
==========================================
+ Hits          213      221       +8     
+ Misses          7        4       -3     

Impacted Files	Coverage Δ
src/flamegraphs.jl	97.02% <0.00%> (+0.06%)	⬆️
src/PProf.jl	99.19% <0.00%> (+2.49%)	⬆️

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