You can't have colon-space in unquoted YAML (plain scalars)

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/.travis.yml b/.travis.yml
index d7d2c7d..cdf74c7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -54,7 +54,7 @@
         - tests/scripts/test_psa_constant_names.py
         # Exclude a few test cases that are failing mysteriously.
         # https://github.com/Mbed-TLS/mbedtls/issues/6660
-        - tests/ssl-opt.sh -e 'Fallback SCSV: .*list'
+        - tests/ssl-opt.sh -e 'Fallback SCSV:\ .*list'
         # Modern OpenSSL does not support fixed ECDH, null or ancient ciphers.
         - tests/compat.sh -p OpenSSL -e 'NULL\|ECDH-\|DES\|RC4'
         - tests/scripts/travis-log-failure.sh