Another attempt at fixing builds

Addresses: https://github.com/golang-migrate/migrate/issues/254

.travis.yml

@@ -26,12 +26,14 @@ cache:
   directories:
     - $GOPATH/pkg
 
-addons:
-  apt:
-    packages:
-      - docker-ce
 
 before_install:
+  # Update docker to latest version: https://docs.travis-ci.com/user/docker/#installing-a-newer-docker-version
+  - curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+  - sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
+  - sudo apt-get update
+  - sudo apt-get -y -o Dpkg::Options::="--force-confnew" install docker-ce
+  # Install golangci-lint
   - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.16.0
   - echo "TRAVIS_GO_VERSION=${TRAVIS_GO_VERSION}"