fix(hooks): match type of Config.runHook to IConfig.runHook

[jgwhite]

This mismatch was proving tricky to work around over in oclif/dev-cli#141

I’d like to do a little more testing against the other packages that depend upon this before I mark it as ready-for-review.

[codecov]

Codecov Report

Merging #158 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #158   +/-   ##
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  Coverage    0.00%   0.00%           
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  Files           2       2           
  Lines          12      12           
  Branches        3       3           
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  Misses         12      12           

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[jgwhite]

@RasPhilCo do you recall the reason for #58 ?

[RasPhilCo]

I believe so folks can define hooks outside the ones typed.

[jgwhite]

Ah, OK. So maybe we should loosen the type for IConfig.runHook?

[jgwhite]

It looks like the narrower type does work for custom hooks (the type of opts expands to simply object)…