fix: support file which named '...'

[howel52]

... or more then two dots may be a file

but throw Error like RangeError: path should be a path.relative()d string, but got "..." now.

[codecov-io]

Codecov Report

Merging #68 (fdfd710) into master (7cc95d2) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #68   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          129       129           
=========================================
  Hits           129       129           

Impacted Files	Coverage Δ
index.js	100.00% <100.00%> (ø)

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[kaelzhang]

I'm really not quite sure about the compatibility cross different file systems.

I'm struggling in my head whether I should make the validation as a convention(warning) or not(error)

[howel52]

yep, maybe we need another solution to solve this bug.