.ci/travis-ci: use latest Docker image

After updating Go and going to Rust toolchain 1.44.0.

Author: benma

.ci/travis-ci

@@ -1,9 +1,24 @@
+# Copyright 2019 Shift Cryptosecurity AG
+# Copyright 2020 Shift Crypto AG
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 #!/bin/bash
 
 set -e
 set -x
 
-CONTAINER=shiftcrypto/firmware_v2:15
+CONTAINER=shiftcrypto/firmware_v2:16
 
 if [ "$1" == "pull" ] ; then
 	docker pull "$CONTAINER"