Add changelog for release 1.1

Signed-off-by: Ondrej Vasko <[email protected]>

CHANGELOG.md

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+# Changelog
+
+This changelog notes changes between versions of Postfwd GeoIP Anti-Spam plugin.
+
+## Version 1.1 [5. Jan 2019]
+
+This stable version introduces docker image based on official postfwd docker image
+and other minor changes. All work done by @Lirt ([email protected]),
+docker review done by @kirecek ([email protected]).
+
+This together with docker-compose template to bootstrap local development
+environment will significantly help in testing and validation.
+
+There are other minor improvements, such as ability to change path to main configuration
+file, which was previously statically defined in `/etc/postfix/anti-spam.conf`.
+
+DockerHub repository was created at URL https://cloud.docker.com/repository/docker/lirt/postfwd-anti-geoip-spam-plugin
+
+Other notable changes are introducement of changelog and tags(releases).
+
+Differences between version 1.0 and 1.1:
+
+### Added
+
+- Environment variables `POSTFWD_ANTISPAM_MAIN_CONFIG_PATH` and
+`POSTFWD_ANTISPAM_SQL_STATEMENTS_CONFIG_PATH`, which can be used to
+override default path to postfwd configuration file and configuration file
+with SQL statements.
+- Logging can now be redirected to STDOUT using empty logfile statement in configuration
+or by removing logfile statement. This solution is backwards compatible.
+- Dockerfile and entrypoint script built on official postfwd image, which
+installs plugin, prepares configuration and default running arguments.
+- `tests` directory with docker-compose template and default configurations to easily
+bootstrap local development environment.
+
+### Changed
+
+- Script now uses `env perl` instead of path to static perl in shebang.
+- Logged lines now contain name of program - postfwd::anti-spam-plugin - run in format
+`<DATE> <PROGRAM> <LOG_LEVEL> <MESSAGE>`. This will help to distinguish between original
+postfwd logs and this postfwd plugin logs.
+- Plugin now tries to connect to database 3 times with 10 second timeout. If it fails
+3 times, it quits.
+- More and improved logging messages about database connection state.
+
+### Removed
+
+## Version 1.0 [12. Nov 2018]
+
+This is first official version and release.
+
+### Added
+
+- Postfwd plugin.
+- Sample configuration files.
+- Installation script.
+- README.md.
+
+### Changed
+
+### Removed