📝 Added changelog list

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]
+### Added
+- This `CHANGELOG.md` file
+
+### Removed
+- `go:generate` comments
+
+## [1.2.0] - 2020-01-14
+### Added
+- `.github/workflows` folder with migration actions for GitHub mirror
+- Internal methods structures for JSON marshling in requests
+
+### Changed
+- GitLab CI configuration for caches and modules support
+- `Makefile` for go modules support
+- Format of the code
+- Removed last linter warnings
+- Added actual package import path into `doc.go`
+- Use `time.Time` structure instead `[]int` in `GetViews` method (yeah, this violates the semantic versioning because backward compatibility breaks, but this is the last time, I promise)
+- Updated go modules in `go.mod`/`go.sum`
+- Force type initialization in constants section
+
+### Fixed
+- Use JSON body instead query strings for better cyrillic support #6
+- Removed `charset` parameter in `Content-Type` header, because sometimes Telegraph answer BadRequest status
+
+## [1.1.0] - 2019-07-24
+### Added
+- [EditorConfig](https://editorconfig.org/)
+- GitLab CI configuration
+- [PreCommit](https://pre-commit.com/) hooks configuration
+- `Makefile` with useful snippets
+- `SUPPORT.md` list with all contributors, helpers and patrons
+- `go.mod` and `go.sum` for go modules support
+- Individual methods tests files
+- Added `types.go` with all available structures and types
+
+### Changed
+- `LICENSE.md` current year
+- Actual package URLs in `README.md`
+- Format `ContentFormat` code
+- Moved all types from methods files into `types.go` file
+- Used copy of structures in all methods instead links, because this arguments is required
+- Renamed `request` method into `makeRequest`
+- Added comments for false-positives linters warnings
+- Renamed `request.go` to `telegraph.go`
+
+### Removed
+- Travis CI configuration due to migration from GitHub to GitLab native CI
+- `CONTRIBUTORS.md` in favor of a single `SUPPORT.md` list
+- `PATRONS.md` in favor of a single `SUPPORT.md` list
+- Badges collection from `README.md`
+- `invalid_test.go`/`valid_test.go` due individual methods tests files
+
+## [1.0.0] - 2018-01-09
+### Added
+- Travis CI configuration
+- Code of conduct info
+- Contributors list
+- License information
+- Patrons list
+- ReadMe
+- All available methods
+- Coverage tests
+
+[Unreleased]: https://gitlab.com/toby3d/telegraph/compare/v1.2.0...develop
+[1.2.0]: https://gitlab.com/toby3d/telegraph/compare/v1.1.0...v1.2.0
+[1.1.0]: https://gitlab.com/toby3d/telegraph/compare/v1.0.0...v1.1.0
+[1.0.0]: https://gitlab.com/toby3d/telegraph/tree/v1.0.0