Vendor data present

[mensfeld]

Hey there,

My name is Maciej Mensfeld and I run security & quality assessment for OSS libraries using WhiteSource Diffend.io.

While reviewing the changes for this lib, I noticed, that the vendor directory is being included.

Is this needed? Usually, it's added by mistake and causes:

a) confusion
b) problems when tracking changes
c) extensive library size

ref: https://my.diffend.io/gems/rfix/2.0.4/3.0.0/page/4#d2h-911935

It seems (at least in 3.0.0 that out of all vendor packages at least dry-cli and strings-ansi are declared as dependencies in the gemspec.

If the presence of vendor data is valid I would love the reasoning. Thanks!