add [openjdk11] to Travis build matrix

[sullis]

Description

add [openjdk11] to Travis build matrix

Motivation and Context

add [openjdk11] to Travis build matrix

Testing

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have read the README document
• I have added tests to cover my changes
• All new and existing tests passed
• A short description of the change has been added to the CHANGELOG

License

• I confirm that this pull request can be released under the Apache 2 license

[brainstorm]

Would like to see this passing, doing a openjdk11 job right now and would like to make sure everything in aws java sdk v2 is passing before digging deeper into the migration :-S

... looks like the travisci error was just a timeout?

[dagnir]

Looks like OpenJDK 11 was added to the build as part of #1139. Going to go ahead and close this one.