Varbase 8.5.4: Update [CHANGELOG.md, UPDATE.md] files and filter the code for Drupal 8 Coding Standard

Varbase 8.5.4 Release notes:

     composer create-project Vardot/varbase-project:8.5.4 PROJECT_DIR_NAME --no-dev --no-interaction
  

Highlighted important changes since Varbase 8.5.3:

• Issue #3012231: Updated [Drupal core] from 8.6.2 to 8.6.3

Added since Varbase 8.5.3:

• No new features, all new features will come in Varbase 8.6.x

Changed since Varbase 8.5.3:

• No changes in this version, as it's only an update for Drupal core.

Updates since Varbase 8.5.3:

• Issue #3012231: Updated [Drupal core] from 8.6.2 to 8.6.3
• Issue #3012288: Updated [Webform] module from ^8.5.0-rc24 to ^8.5.0-rc26

Fixes since Varbase 8.5.3:

• No fixes in this version, as it's only an update for Drupal core.

Updating Varbase 8.5.3 to Varbase 8.5.4

The UPDATE.md file.
https://github.com/Vardot/varbase/blob/8.x-5.x/UPDATE.md

Updated Change log file:

https://github.com/Vardot/varbase/blob/8.x-5.x/CHANGELOG.md

Varbase Automated Functional Testing

https://github.com/Vardot/varbase/blob/8.x-5.x/tests/README.md

Varbase Gherkin features

https://github.com/Vardot/varbase/blob/8.x-5.x/tests/features/varbase/RE...