This update for viewvc fixes the following issues:

- update to 1.1.28 (boo#1167974, CVE-2020-5283):
* security fix: escape subdir lastmod file name (#211)
* fix standalone.py first request failure (#195)
* suppress stack traces (with option to show) (#140)
* distinguish text/binary/image files by icons (#166, #175)
* colorize alternating file content lines (#167)
* link to the instance root from the ViewVC logo (#168)
* display directory and root counts, too (#169)
* fix double fault error in standalone.py (#157)
* support timezone offsets with minutes piece (#176)

This update was imported from the openSUSE:Leap:15.1:Update update project.