Add Changelog

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+- Custom copy/paste fields (ex: `kubectl config set-cluster [...]`)
+- More prometheus exports
+- UX improvements
+
+## [2.6.0] - 2019-04-02
+### Added
+- Prometheus endpoint (:9090 by default)
+
+  Current available metrics:
+  - loginapp_request_total{"code", "method"}: Counter vector
+  - loginapp_request_duration{"code", "method"}: Gauge vector
+
+  More metrics will be added in feature minor upgrades
+
+- Support extra auth code options.
+
+  loginapp now supports extra auth code options, to ensure
+  compatibility with IdP like ADFS (see issue #16)
+  Configuration option:
+  ```
+  [...]
+  oidc:
+    extra_auth_code_opts:
+      resource: XXXXX
+  [...]
+  ```
+
+- Changelog :)
+
+### Changed
+- Code refactor: to easily add prometheus metrics, we had to
+  split code. Current logic is:
+  - `cli.go`: CLI related code
+  - `config.go`: app configuration
+  - `handlers.go`: main router handlers
+  - `logging.go`: logging related code
+  - `main.go`: app entrypoint
+  - `prometheus.go`: prometheus metrics setup
+  - `routes.go`: main router setup
+  - `server.go`: server related code
+  - `templates.go`: html templates
+  - `util.go`: another util garbage file...
+
+  Also update checks and go fmt
+
+- Improve user requests logging: add return code
+
+## [2.5.0] - 2018-12-21
+### Added
+- Show a kubectl based version of configuration update (see PR #12) from (@aveyrenc)[https://github.com/aveyrenc]
+
+## [2.4.1] - 2018-11-05
+### Fixed
+- License field issues
+
+## [2.4.0] - 2018-10-28
+### Changed
+- Evacuate html templates from binary.
+  It allows users to override default assets.
+
+## [2.3.0] - 2018-10-24
+### Added
+- Customizable username claim. You can now change output username claim
+  in loginapp configuration.
+
+  Default is set to "name". "name" and "email" are
+  common claims, the full list of supported claims
+  are available at 'well-known' URL of your issuer
+  (ex: https://dex.example.com/.well-known/openid-configuration)
+
+- Golang syntax improvements
+
+### Changed
+- Configuration checks methods: simply code to easily include
+  new configuration option and associated check function
+
+## [2.2.0] - 2018-10-11
+### Added
+- Debug output
+
+### Changed
+- Split CLI setup from main
+
+### Fixed
+- `offline_as_scope` option (see PR #4) from [@robbiemcmichael](https://github.com/robbiemcmichael)
+- Log typos
+
+## [2.1.0] - 2018-08-15
+### Added
+- HTML frontend click/copy feature
+- Ability to use your own assets
+- Skip main page option (`web_output.skip_main_page`)
+- Document new opts in README, add a dev doc
+- Configuration checks
+
+### Changed
+- Code refactoring
+
+### Fixed
+- Multiple client_id in html render when using cross_client feature
+  (related to option `web_output.main_client_id`).
+
+## [2.0.2] - 2018-07-18
+### Added
+- Code checks and format: gofmt, errcheck, gocyclo, gosimple
+
+## [2.0.1] - 2018-07-17
+### Added
+- App description and version in CLI
+
+## [2.0.0] - 2018-07-13
+### Added
+- Apache 2.0 LICENSE
+- Dependencies management
+- Better example files
+- Real CLI (`loginapp serve [configfile]`)
+- Support loglevel configuration
+- Exponential retry backoff when at startup when setting up
+  provider
+
+- `/healthz` endpoint (for k8s) --> Check: provider is setup, provider availability
+
+### Changed
+- Code refactoring
+- Cleaner config format
+- More debug (ex: middleware logger for incoming requests)
+- Move code to root directory
+
+### Removed
+- No more `alpine` Docker image, only scratch
+
+## [1.1.1] - 2018-04-24
+### Added
+- quay.io repository: [fydrah/loginapp](quay.io/fydrah/loginapp)
+
+### Removed
+- DockerHub repository
+
+### Fixed
+- Typos
+
+## [1.1.0] - 2018-04-06
+### Added
+- Docker images (scratch and alpine)
+
+### Fixed
+- Typos and add precise title for cross client field
+
+### Removed
+- Useless entrypoint
+
+## [1.0.0] - 2017-12-28
+### Added
+- Init
+
+
+[Unreleased]: https://github.com/fydrah/loginapp/compare/2.6.0...HEAD
+[2.5.0]: https://github.com/fydrah/loginapp/compare/2.5.0...2.6.0
+[2.4.1]: https://github.com/fydrah/loginapp/compare/2.4.1...2.5.0
+[2.4.0]: https://github.com/fydrah/loginapp/compare/2.4.0...2.4.1
+[2.3.0]: https://github.com/fydrah/loginapp/compare/2.3.0...2.4.0
+[2.2.0]: https://github.com/fydrah/loginapp/compare/2.2.0...2.3.0
+[2.1.0]: https://github.com/fydrah/loginapp/compare/2.1.0...2.2.0
+[2.0.2]: https://github.com/fydrah/loginapp/compare/2.0.2...2.1.0
+[2.0.1]: https://github.com/fydrah/loginapp/compare/2.0.1...2.0.2
+[2.0.0]: https://github.com/fydrah/loginapp/compare/2.0.0...2.0.1
+[1.1.1]: https://github.com/fydrah/loginapp/compare/1.1.1...2.0.0
+[1.1.0]: https://github.com/fydrah/loginapp/compare/1.1.0...1.1.1
+[1.0.0]: https://github.com/fydrah/loginapp/compare/1.0.0...1.1.0