Update README and add CHANGELOG file

CHANGELOG.md

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+## 1.0.0
+
+*Breaking changes* of the linter usage. The linter now is a Django management command.
+It shoud be used with a `python manage.py lintmigrations` followed by the usual options.
+Additionally, the linter now needs to be added the to the `INSTALLED_APPS` in your Django settings.
+
+* The linter is now much faster: we don't setup django once for each migration
+* The linter is now more robust: we rely on Django internals to discover migrations
+* Clean up of the testing setup: it is cleaner, less brittle and we have more confidence that it works
+
+## 0.1.5
+
+* Bug fix: handle migration files with spaces in their name by quoting the migration name
+
+## 0.1.4
+
+* Explicitly test for mysql, sqlite3 and postgresql
+* Fix alter column type detection in postgresql
+* Do not create cache folder when -no-cache option
+* Fix tests on Windows
+* Use the same Python interpreter as used for launching the linter, instead of manually trying to re-create the path
+
+## 0.1.3
+
+* Fixes migrations that are ignored to generate empty SQL, that PostgreSQL complains about. It throws an exception making migrations fail, that are in fact valid. (Thanks to @fevral13 and @mes3yd)
+* Add options -V and --version to show the current linter version
+
+## 0.1.2
+
+* Bug fix: handle when the linter is called in the working dir django-migration-linter .
+* Bug fix: don't assume that the git root is at the same path as the django project
+
+## 0.1.1
+
+* Fix caching when app is in a folder and not at the root of the project
+* Do not check for .git folder at root, because it might be located somewhere else. Let git itself do the job
+* Make some imports relative
+
+## 0.1.0
+
+The django migration linter is now set to a Beta version, instead of Alpha since it has been used for quite some time.
+
+Version 0.1.0 comes with:
+
+* Possibility to ignore migration files entirely (without specifying them on the command line)
+* This can be used by adding the migration operation IgnoreMigration() in the migrations operations list. See readme
+* Caching. We cache failed and succeeded migrations (w.r.t. migration linting) in a cache file.
+* Each migration file is stored as the MD5 hash of its content with the result of the linting
+
+Other things:
+
+* Added support for Python 3.7
+* Added support for Django 2.1
+* The codebase is now in black format to improve Python-code readability
+* 2019 ! Happy new year
+
+## 0.0.7
+
+* Minor bug fix when no errors detected
+
+## 0.0.6
+
+* Use logger correctly
+* Drop django 1.10 support
+
+## 0.0.5
+
+* Only consider added migrations during linting
+* Change readme to rst format (for PyPi)
+* Added examples folder
+* Add django (at least 1.10) as requirement for the linter
+
+## 0.0.4
+
+Assure compatibility for multiple python and django versions.
+
+* Try to improve PyPi readme
+* Better error messages
+
+## 0.0.3
+
+* Made a mistake and accidentally deleted 0.0.2 from PyPi
+
+## 0.0.2
+
+* Python 3 compatibility
+* Faster migration gathering
+
+* Code base refactoring
+* Test base refactoring
+
+## 0.0.1
+
+First version of command line tool to lint django migrations.