Bump github.com/mattermost/mattermost-server/v5 from 5.19.0 to 5.19.1 in /dependabot (#72)

Bump github.com/mattermost/mattermost-server/v5 in /dependabot

Bumps [github.com/mattermost/mattermost-server/v5](https://github.com/mattermost/mattermost-server) from 5.19.0 to 5.19.1.
- [Release notes](https://github.com/mattermost/mattermost-server/releases)
- [Changelog](https://github.com/mattermost/mattermost-server/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mattermost/mattermost-server/compare/v5.19.0...v5.19.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

.travis.yml

@@ -1,7 +1,7 @@
 language: c
-dist: trusty
-sudo: required
-service:
+os: linux
+dist: bionic
+services:
   - docker
 env:
   global:
@@ -26,7 +26,7 @@ env:
     - GOOS='openbsd' GOARCH='amd64'
     - GOOS='openbsd' GOARCH='arm'
 before_install:
-  - export MATTERMOST_RELEASE="$(grep 'version' dependabot/Gopkg.toml | cut -d'"' -f2)"
+  - export MATTERMOST_RELEASE="$(grep 'mattermost' dependabot/go.mod | cut -d' ' -f3)"
   - docker pull "${DOCKER_IMAGE}"
   - chmod +x build.sh
 script: