update vendor

Signed-off-by: Roland.Ma <rolandma@yunify.com>

vendor/github.com/monochromegane/go-gitignore/README.md

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+# go-gitignore [![Build Status](https://travis-ci.org/monochromegane/go-gitignore.svg)](https://travis-ci.org/monochromegane/go-gitignore)
+
+A fast gitignore matching library for Go.
+
+This library use simple tree index for matching, so keep fast if gitignore file has many pattern.
+
+## Usage
+
+```go
+gitignore, _ := gitignore.NewGitIgnore("/path/to/gitignore")
+
+path := "/path/to/file"
+isDir := false
+gitignore.Match(path, isDir)
+```
+
+### Specify base directory
+
+go-gitignore treat `path` as a base directory.
+If you want to specify other base (e.g. current directory and Global gitignore), you can like the following.
+
+```go
+gitignore, _ := gitignore.NewGitIgnore("/home/you/.gitignore", ".")
+```
+
+### From io.Reader
+
+go-gitignore can initialize from io.Reader.
+
+```go
+gitignore, _ := gitignore.NewGitIgnoreFromReader(base, reader)
+```
+
+## Simple tree index
+
+go-gitignore parse gitignore file, and generate a simple tree index for matching like the following.
+
+```
+.
+├── accept
+│   ├── absolute
+│   │   └── depth
+│   │       ├── initial
+│   │       └── other
+│   └── relative
+│       └── depth
+│           ├── initial
+│           └── other
+└── ignore
+    ├── absolute
+    │   └── depth
+    │       ├── initial
+    │       └── other
+    └── relative
+        └── depth
+            ├── initial
+            └── other
+```
+
+## Features
+
+- Support absolute path (/path/to/ignore)
+- Support relative path (path/to/ignore)
+- Support accept pattern (!path/to/accept)
+- Support directory pattern (path/to/directory/)
+- Support glob pattern (path/to/\*.txt)
+
+*note: glob pattern*
+
+go-gitignore use [filepath.Match](https://golang.org/pkg/path/filepath/#Match) for matching meta char pattern, so not support recursive pattern (path/`**`/file).
+
+## Installation
+
+```sh
+$ go get github.com/monochromegane/go-gitignore
+```
+
+## Contribution
+
+1. Fork it
+2. Create a feature branch
+3. Commit your changes
+4. Rebase your local changes against the master branch
+5. Run test suite with the `go test ./...` command and confirm that it passes
+6. Run `gofmt -s`
+7. Create new Pull Request
+
+## License
+
+[MIT](https://github.com/monochromegane/go-gitignore/blob/master/LICENSE)
+
+## Author
+
+[monochromegane](https://github.com/monochromegane)
+