Remove deprecated @types/pkg-dir and pkg-dir

[mayurkale22]

The @types/pkg-dir package has been deprecated. https://www.npmjs.com/package/@types/pkg-dir

[codecov-io]

Codecov Report

Merging #438 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #438      +/-   ##
=========================================
+ Coverage   94.88%   94.9%   +0.02%     
=========================================
  Files         141     141              
  Lines        9321    9321              
  Branches      673     673              
=========================================
+ Hits         8844    8846       +2     
+ Misses        477     475       -2

Impacted Files	Coverage Δ
...ages-frontend/page-handlers/statsz.page-handler.ts	83.33% <0%> (ø)	⬆️
...zpages-frontend/page-handlers/rpcz.page-handler.ts	100% <0%> (ø)	⬆️
test/test-http2.ts	99.33% <0%> (+1.32%)	⬆️

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[mayurkale22]

@draffensperger I have removed dependency on pkg-dir package also, as it is not supported for node 6 -> https://github.com/sindresorhus/pkg-dir/blob/master/package.json#L13

Once you have time, please take a look again. Thanks.

[draffensperger]

Nice to prune one dependency!