Added CHANGELOG.md file.

Author: azizk

CHANGELOG.md

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+# Changelog
+
+## [v2.0.0] – 2021-04-27
+
+The Elixir syntax definition has been reworked amounting to a complete rewrite
+bringing among other things the following features and improvements:
+
+- Type highlighting in `@spec`, `@type`, `@typep`, `@opaque`, `@callback` and `@macrocallback`.
+- Parameter highlighting (also in `fn`, `case`, `with`, `for`, `try` and `receive`).
+- Function call highlighting (e.g. `inspect error`, `Enum.map(...)`).
+- Highlight `as: A` argument in alias/require statements.
+- Better matching for def/defmodule/etc. statements.
+- Highlight quoted member variables/functions (e.g. `:erlang."=/="(1, 2)`).
+- Fixes to strings, numerics, escapes, captures etc.
+- Newest Elixir operators and functions.
+- Highlight LiveView, YAML and JSON strings.
+- Syntax definition for EEx in Elixir (e.g. `defmodule <%= @module %>.View do end`)
+- Some keywords are variables depending on the context (e.g. `def = 0`).
+- Markdown highlighting within `@doc` comments and also Elixir code examples.
+- Highlight SQL (e.g. jsonb operators) inside the Ecto `fragment()` function (also for general usage: `sql("INSERT INTO ...")`).
+- Git merge conflicts are highlighted.
+- Added Monokai and Mariana theme color scheme rules.
+- Correct scope for symbol names for the "Go to Definition" command.
+- Speed optimizations: rules and regexps are ordered in such a way
+  that they match the most likely occurring tokens first.
+- Snippets for `|> IO.inspect(label: "...")`, `|> then()` and `|> tap()`.
+- Extensive test-suite containing countless checks to ensure quality and avoid regressions.
+- Fixed Github CI syntax tests job.
+
+## [v1.7.0] – 2020-05-20
+
+Thanks @dkarter
+- Allow leex file to be picked up
+
+## [v1.6.0] – 2019-11-20
+
+Thanks to @azizk again
+- We now have regex syntax highlighting
+- EEx syntax highlighting now reuses html definition and interpolates Elixir parts into it
+- various fixes on general Elixir syntax definition
+- comprehensive sublime syntax tests
+
+## [v1.3.0] – 2019-03-22
+
+Thanks to @azizk
+- Also apply syntax to files with elixirc and iex in hashbang
+- Module names can only have ASCII letters, fixed regex to do that
+- Highlight module names as normal atoms when found in map/kwlist keys
+- Highlight unicode identifers for atoms, variables and function names
+
+## [v1.2.0] – 2019-02-13
+
+- Add Comment so we don't need https://github.com/elixir-editors/elixir-tmbundle alongside
+
+## [v1.1.3] – 2019-02-01
+
+- Fix binary `^^^` highlight
+- Highlight more operators
+
+## [v1.1.0] – 2017-12-13
+
+- Add HTML (EEX)