vss-tools: Bump submodule

  34de2b2 Travis: Use requirements.txt
  b59d6b0 Use /usr/bin/env python3 everywhere
  f160b33 Add Travis build to vss-tools
  14efa2e Changed N.m to Nm
  67b13c6 Bugfix: Add previously removed method
  b6814db Typo in Enum Handling for UInt64 fixed
  4497a47 Added typesafe parsing using anytree, including tests and ReadMe.MD Migrated csv parser for demonstration purposes
  55ae597 Merge pull request #4 from magnusfeuer/master
  7039c86 Fixes issue COVESA/vss-tools#4 (comment)
  51757b5 cnative tool refactoring.
  7fbe9ce Adding Licence file
  416da82 Introduced dictionary-parsing vspec.py.

Signed-off-by: Gunnar Andersson <gandersson@genivi.org>