Remove vendor folder

[mochi-co]

Following our discussing in #314, we have decided to remove the vendor folder and no longer continue packaging it.

This PR removes the vendor folder.

[coveralls]

Pull Request Test Coverage Report for Build 6525093770

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 98.908%

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Totals
Change from base Build 6493814405:	0.0%
Covered Lines:	5436
Relevant Lines:	5496

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💛 - Coveralls

[dgduncan]

Should we add the vendor to .gitignore so that vendor does not get committed again?

[mochi-co]

@dgduncan good idea

[dadebue]

I haven't been part of discussion #314, are you sure you want me to review? 😜