Notify team on Travis CI failures.

Bug b/115784742

Change-Id: Id3225adcaf77e1d26560151c506e885318bd0ff6
Reviewed-on: https://swiftshader-review.googlesource.com/21088
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index 8b639bc..58e4769 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,6 +23,13 @@
   - make
   - ./unittests
 
+notifications:

+  email:

+    recipients:

+      - swiftshader-team@google.com

+    on_success: never

+    on_failure: always
+
 deploy:
   provider: gcs
   access_key_id: GOOGUX6FX5STNWQ5LHZ5