Install TagBot as a GitHub Action

[JuliaTagBot]

You're receiving this pull request because the now-deprecated Julia TagBot GitHub App is installed for this repository. This pull request installs TagBot as a GitHub Action.
If this PR does not belong in this repository for any reason, feel free to close it.

See this Discourse thread for more details and to ask questions.
Please do not comment on this pull request, because it is unlikely that I (@christopher-dG) will see it.

[codecov-io]

Codecov Report

Merging #8 into master will increase coverage by 1.1%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master       #8     +/-   ##
=========================================
+ Coverage   42.73%   43.84%   +1.1%     
=========================================
  Files           8        8             
  Lines         730      764     +34     
=========================================
+ Hits          312      335     +23     
- Misses        418      429     +11

Impacted Files	Coverage Δ
src/powell.jl	57.14% <0%> (-9.53%)	⬇️
src/spg2.jl	86.59% <0%> (-2.04%)	⬇️
src/cobyla.jl	67.27% <0%> (-0.66%)	⬇️
src/bindings.jl	50.84% <0%> (+1.76%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 041dcb9...e3f2020. Read the comment docs.