Reformats spdx.parsers.tagvalue to conform to pep8
Reformats spdx.parsers.tagvalue to conform to pep8

Signed-off-by: Ahmed H. Ismail <17be99835f39b7679f83bf2695d44e1f53f60100@gmail.com>

bmwcarit/spdx-tools-python,spdx/tools-python,ah450/spdx-tools-python