Create CHANGELOG.md

CHANGELOG.md

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+# CHANGELOG
+
+## [2.0.0] - 2021-02-16
+
+### Added
+- configurable timeout option
+- support for container with alternative browser
+- verbose option for more [Nagios Guidelines](https://nagios-plugins.org/doc/guidelines.html#PLUGOUTPUT) compliant error output
+
+### Changed 
+- calculate exec_time based on execution all tests in all suites from all side files
+- aggregated passed, failed, and total counters for all tests
+
+### Fixed
+- process and support more than one side file, issue
+  [osdis/check_selenium_docker#6](https://github.com/opsdis/check_selenium_docker/issues/6)
+- exec_time calculation error in the absence of tests, issue
+  [osdis/check_selenium_docker#5](https://github.com/opsdis/check_selenium_docker/issues/5)