chore(deps): update

[alexander-akait]

fixes #170

Notes:

• precompile-charcodes is abandoned and don't have compatibility with babel@7, just change charCodeAt on number (keep perf)
• test with same names are prohibited so i added (2)/(3)/etc
• snapshots are changes, just update their

[alexander-akait]

No need major release right now, i want to fix:
#173
#174
#175

maybe it is already fixed after updating cssesc, but i want to add tests to avoid future regressions

[coveralls]

Coverage decreased (-0.01%) to 95.383% when pulling 9ee0079 on chore-deps-update into b1da0fa on master.

[jonathantneal]

Great work, @evilebottnawi. As far as semver is concerned, is this a patch release?

[alexander-akait]

/cc @jonathantneal
Major after update cssesc, need merge this too https://github.com/postcss/postcss-selector-parser/pulls (one fix)

[jonathantneal]

All set for the next major (v6.0.0)?

[alexander-akait]

@jonathantneal yep