Removed 'version' from docker-compose.yml

[sjanssen15]

Description

Users will get a warning that 'version' is obsolete in Docker compose. Remove version from docker-compose.yml since it's obsolete and shouldn't be used.

Related Issue

#726

Motivation and Context

How Has This Been Tested?

Removing the 'version' does not have any impact and removes the warning message.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added the Signed-off-by statement at the end of my commit message.