MQE-2180: CHANGELOG.MD and Composer version bump (magento#740)

* MQE-2180: CHANGELOG.MD and Composer version bump

* MQE-2180: CHANGELOG.MD and Composer version bump

Merge pull request magento#737 from magento/MQE-2153-2

MQE-2153: CHANGELOG.md updated and composer version bumped to 3.0.0-RC4

Create MFTF Release Candidate 3

Merge pull request magento#659 from magento/2.6.4-develop

MQE-2052: MFTF uses undeclared dependency

Merge pull request magento#605 from magento/MQE-2008

MQE-2008: Filter test generation and execution by severity

Merge pull request magento#600 from magento/MQE-1997

Mqe 1997: Type float is wrongly treated as integer in assert actions

Merge pull request magento#599 from magento/2.6.1-RC

2.6.1 rc to Master

MQE-1969: Updated CHANGELOG.md and bumped MFTF package version

Merge pull request magento#529 from magento/2.5.4-DemoLink

2.5.4 demo link

Merge pull request magento#498 from magento/MQE-1870

MFTF 2.5.3 + MQE-1870