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: Ie1e4281efee4461f61cdffa3791c22cd5fbf54ec Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>