Update module spf13/viper to v1.6.2 (#272)

Update module spf13/viper to v1.6.2

Reviewed-on: https://kolaente.dev/vikunja/api/pulls/272

vendor/gopkg.in/ini.v1/README.md

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+# INI
+
+[![Build Status](https://img.shields.io/travis/go-ini/ini/master.svg?style=for-the-badge&logo=travis)](https://travis-ci.org/go-ini/ini) [![Sourcegraph](https://img.shields.io/badge/view%20on-Sourcegraph-brightgreen.svg?style=for-the-badge&logo=sourcegraph)](https://sourcegraph.com/github.com/go-ini/ini)
+
+![](https://avatars0.githubusercontent.com/u/10216035?v=3&s=200)
+
+Package ini provides INI file read and write functionality in Go.
+
+## Features
+
+- Load from multiple data sources(`[]byte`, file and `io.ReadCloser`) with overwrites.
+- Read with recursion values.
+- Read with parent-child sections.
+- Read with auto-increment key names.
+- Read with multiple-line values.
+- Read with tons of helper methods.
+- Read and convert values to Go types.
+- Read and **WRITE** comments of sections and keys.
+- Manipulate sections, keys and comments with ease.
+- Keep sections and keys in order as you parse and save.
+
+## Installation
+
+The minimum requirement of Go is **1.6**.
+
+```sh
+$ go get gopkg.in/ini.v1
+```
+
+Please add `-u` flag to update in the future.
+
+## Getting Help
+
+- [Getting Started](https://ini.unknwon.io/docs/intro/getting_started)
+- [API Documentation](https://gowalker.org/gopkg.in/ini.v1)
+
+## License
+
+This project is under Apache v2 License. See the [LICENSE](LICENSE) file for the full license text.