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.