Disable symlinks by default

[leo]

In order to prevent potential security issues, the team has decided to disable symlinks by default.

To enable them, you can define the symlinks option:

{
   "symlinks": true
}

Furthermore, this pull request also adds a new handler for fs.realpath, which is responsible for resolving the target of symlinks if they are enabled.

[codecov]

Codecov Report

Merging #84 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #84   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines         320    324    +4     
=====================================
+ Hits          320    324    +4

Impacted Files	Coverage Δ
src/index.js	100% <100%> (ø)	⬆️

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