Allow to add custom tags

[crazy-max]

Closes #18

[codecov]

Codecov Report

Merging #24 (135cce8) into master (9de4428) will decrease coverage by 1.03%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
- Coverage   72.94%   71.91%   -1.04%     
==========================================
  Files           3        3              
  Lines          85       89       +4     
  Branches       18       20       +2     
==========================================
+ Hits           62       64       +2     
  Misses          6        6              
- Partials       17       19       +2     

Impacted Files	Coverage Δ
src/context.ts	92.30% <ø> (ø)
src/meta.ts	73.13% <60.00%> (-1.47%)	⬇️

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[LongLiveCHIEF]

Not what I originally had in mind, but I think it works, and as a bonus, I think it actually closes #13 as well. I need to play around with this a bit later today before giving it the full "that'll work!", but initial impressions are that it will indeed work as needed.