[chore] remove vendor

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diff --git a/vendor/github.com/huandu/xstrings/CONTRIBUTING.md b/vendor/github.com/huandu/xstrings/CONTRIBUTING.md
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-# Contributing #
-
-Thanks for your contribution in advance. No matter what you will contribute to this project, pull request or bug report or feature discussion, it's always highly appreciated.
-
-## New API or feature ##
-
-I want to speak more about how to add new functions to this package.
-
-Package `xstring` is a collection of useful string functions which should be implemented in Go. It's a bit subject to say which function should be included and which should not. I set up following rules in order to make it clear and as objective as possible.
-
-* Rule 1: Only string algorithm, which takes string as input, can be included.
-* Rule 2: If a function has been implemented in package `string`, it must not be included.
-* Rule 3: If a function is not language neutral, it must not be included.
-* Rule 4: If a function is a part of standard library in other languages, it can be included.
-* Rule 5: If a function is quite useful in some famous framework or library, it can be included.
-
-New function must be discussed in project issues before submitting any code. If a pull request with new functions is sent without any ref issue, it will be rejected.
-
-## Pull request ##
-
-Pull request is always welcome. Just make sure you have run `go fmt` and all test cases passed before submit.
-
-If the pull request is to add a new API or feature, don't forget to update README.md and add new API in function list.