MQE-622: Update CHANGELOG.md formatting

Author: okolesnyk

CHANGELOG.md

@@ -1,24 +1,29 @@
-# MFTF Version 1.0 - Changelog
+Magento Functional Testing Framework Changelog
+================================================
 
-## Initial commit of MFTF v1.0.0
+1.0.0
+------
 
-### Core Features:
+### Core features
 
 * **Traceability** for clear logging and reporting capabilities
 * **Modularity** to run tests based on modules/extensions installed
 * **Customizability** to have an ability to customize existed tests
 * **Readability** using clear declarative XML test steps
 * **Maintainability** based on simple test creation and overall structure
 
-### Supported Systems
+### Supported systems
 
-* OS
-  * Windows 10
-  * OSX (Sierra)
-* Browser
-  * Chrome (Latest) with ChromeDriver Latest
+#### Operation systems
 
-### Known Issues
+* Windows 10
+* macOS Sierra
+
+#### Browser
+
+* Chrome (Latest) with ChromeDriver Latest
+
+### Known issues
 
 * Support for Firefox is currently incomplete. This will be resolved to support Firefox 57 (Quantum) and latest Gecko driver in next minor release.
-* MAGENTO_BASE_URL in .env file must have final "/" e.g. "http://magento.com/"
+* `MAGENTO_BASE_URL` in _.env_ file must have `/` at the end. Example: http://magento.com/