Pygments release 2.4.0 which added a python requires that excludes all
versions of Python < 3.5. The LFCI's default 3 version is 3.4 so causes
build failure.
Change-Id: I109abca54d4a87fa45c6397a1f55257d67a7ef6a Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>