update acorn version to better handle the object pattern

[AlexisTessier]

Due to an error in the old version of acorn, it is impossible to use the key name "set" in a object pattern, like that :

function load2({set = 'hello'}) { return load('tt'); }

I just updated the acorn dependency.

I also added a test to check this specific use case but I'm not sure it's pertinent because the real issue is that the dependency was not up to date.

[goto-bus-stop]

thanks, this looks good! could you remove the package-lock file and use the ^ semver operator in the dependency, so we'll get future updates too?

[AlexisTessier]

Done in the last commit.

[goto-bus-stop]

perf, thanks!

[goto-bus-stop]

📦 4.6.0