docs: add reference to Travis CI

Add a doc where a link to Travis CI can be found.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/BUILD b/BUILD
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+A Travis CI instance for continuous integration testing of netsniff-ng
+can be found here:
+
+  https://travis-ci.org/netsniff-ng/netsniff-ng