Add Slack notifications for Travis builds
diff --git a/.travis.yml b/.travis.yml
index c347743..f1c9628 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,4 +8,7 @@
 - tar xzf /tmp/cmake.tar.gz
 - export PATH=$PWD/cmake-3.3.1-Linux-x86_64/bin/:$PATH
 script:
-- ./build.sh all test
+- "./build.sh all test"
+notifications:
+  slack:
+    secure: WdgYxQrnFR5eu/eKygPuLjlFsuZxD9m2PLRWTLT85aj+18Gp2ooPjnI9UFdb1xY87+4InhWk6PvQU35j4bG0etPQtX+0H4T4Zdk/aD6KxgJBHIYGqtfZUMmdFfVpUH9cCPx99Jjw81mhKrxM+6rXiZdiWXuNhvbJOApRT6uxE2k=