travis: Add python3-sphinx to the package list
In order to build htmldocs we need sphinx-build which comes from
python3-sphinx.
Signed-off-by: 
Tom Rini <trini@konsulko.com>
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In order to build htmldocs we need sphinx-build which comes from
python3-sphinx.
Signed-off-by: Tom Rini <trini@konsulko.com>