add chromeFlags, chromePath and --headless as default

[gorangajic]

• fixes #146 pdf only works in headless mode
• fixes #184 Add chromePath and chromeFlags to ChromelessOptions

[adieuadieu]

@gorangajic Thank you for this PR. Would you mind adding chromePath while you're at it? See #184

[schickling]

@adieuadieu you had the most experience with the Chrome part. Please go ahead!

[kawikadkekahuna]

Will chromeFlags support a --no-sandbox mode? It seems like ArchLinux uses SUID instead of Namespace, which is preventing chrome from launching different instances with unique debugging ports. This would be extremely useful to run tests using chromeless in parallel locally.

[jborden13]

@gorangajic do you know if this will allow proxies set in the flags to work on Lambda?

[gorangajic]

@jborden13 not sure

[codecov-io]

Codecov Report

Merging #192 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #192   +/-   ##
=======================================
  Coverage   38.03%   38.03%           
=======================================
  Files           7        7           
  Lines         844      844           
  Branches      116      116           
=======================================
  Hits          321      321           
  Misses        523      523

Impacted Files	Coverage Δ
src/api.ts	47.71% <ø> (ø)	:arrow_up:
src/chrome/local.ts	54.38% <ø> (ø)	:arrow_up:

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[IAMtheIAM]

What is waiting for this to be merged?