Add Python 3.9 to build

[gliptak]

Signed-off-by: Gábor Lipták [email protected]

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[gliptak]

/assign @roycaihw

Travis failure seems to be an intermittent unrelated to this PR

[roycaihw]

/lgtm
/approve

Test flake fixed in #1329

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This pull-request has been approved by: gliptak, roycaihw

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[gliptak]

@roycaihw kubernetes-client/python-base#217