Fix Travis CI
Fix Travis CI

Commit 7d805f74ecbf7f0721742f74f6d381945a09fc12 renamed the test directory.
The same commit also added new Makefile targets, therefore the vendor
target now has to be added explicitly.

Signed-off-by: Stefan Weil <8d4c780fcfdc41841e5070f4c43da8958ba6aec0@weilnetz.de>

UB-Mannheim/ocr-fileformat,UB-Mannheim/ocr-fileformat,UB-Mannheim/ocr-fileformat,UB-Mannheim/ocr-fileformat