Add isRunByDefault option to command.run()

[rizzlesauce]

https://github.com/oclif/oclif/issues/277

[codecov[bot]]

Codecov Report

Merging #100 into master will decrease coverage by 66.81%. The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #100       +/-   ##
=========================================
- Coverage   66.81%     0%   -66.82%     
=========================================
  Files           7      2        -5     
  Lines         452     12      -440     
  Branches      127      3      -124     
=========================================
- Hits          302      0      -302     
+ Misses        101     12       -89     
+ Partials       49      0       -49

Impacted Files	Coverage Δ
src/index.ts	0% <0%> (-100%)	:arrow_down:
src/debug.ts	0% <0%> (-45.46%)	:arrow_down:
src/ts-node.ts
src/plugin.ts
src/util.ts

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[rizzlesauce]

I need to add more to this to get to the desired signature of: Command.run({isRunByDefault: boolean}).

EDIT: this is done

[RasPhilCo]

Thanks for the PR on this @rizzlesauce! I really don't like to not use your efforts, but this particular solution was an edge case that was easier for me to write than explain. Thanks for your patience as well!

See my comment https://github.com/oclif/oclif/issues/277#issuecomment-668271675 on adding a root index command.