Update to clap-3.1 and cargo-0.61

[lu-zero]

No description provided.

[codecov-commenter]

Codecov Report

Merging #255 (a690e05) into master (3584f2b) will decrease coverage by 2.71%.
The diff coverage is 84.53%.

@@            Coverage Diff             @@
##           master     #255      +/-   ##
==========================================
- Coverage   84.27%   81.56%   -2.72%     
==========================================
  Files          12       12              
  Lines        1819     1833      +14     
==========================================
- Hits         1533     1495      -38     
- Misses        286      338      +52     

Impacted Files	Coverage Δ
src/cli.rs	84.27% <77.77%> (-4.28%)	⬇️
src/bin/capi.rs	80.43% <81.81%> (-3.57%)	⬇️
src/bin/cbuild.rs	77.77% <83.33%> (-2.87%)	⬇️
src/bin/cinstall.rs	78.57% <83.33%> (-2.08%)	⬇️
src/bin/ctest.rs	77.77% <83.33%> (-2.87%)	⬇️
src/build.rs	80.39% <100.00%> (-4.43%)	⬇️
src/config.rs	100.00% <100.00%> (ø)
src/install.rs	73.79% <100.00%> (ø)
src/pkg_config_gen.rs	86.85% <100.00%> (ø)
... and 2 more

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[lu-zero]

Sadly a design change decision in clap broke silently quite a bit. clap-rs/clap#3621