Pygments released 2.4.0 which added a python requires that excludes all
versions of Python < 3.5. The LFCI's default Python 3 version is 3.4 so
causes build failure.
Change-Id: Iec3de2d14754b2b4d52ea9e2e4c07006ec5d3f62 Signed-off-by: Thanh Ha <zxiiro@gmail.com>