changed events module to named export.

[mitolog]

This is a fix for error like:

../node_modules/cac/types/CAC.d.ts:2:8 - error TS1192: Module '"events"' has no default export.                                  

2 import EventEmitter from 'events';
         ~~~~~~~~~~~~

this may be regression on ver 6.5.1
70bc533#diff-8a596384c8f493a602203435e2130014L1

And it's same workaround as before:
c087963

[codecov-io]

Codecov Report

Merging #48 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #48   +/-   ##
=======================================
  Coverage   59.11%   59.11%           
=======================================
  Files           6        6           
  Lines         362      362           
  Branches       91       85    -6     
=======================================
  Hits          214      214           
  Misses        145      145           
  Partials        3        3

Impacted Files	Coverage Δ
src/CAC.ts	69.23% <100%> (ø)	⬆️

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[egoist]

🎉 This PR is included in version 6.5.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[mitolog]

how quick merge! thanks @egoist