Updated docker installation steps to install latest docker and docker…

…-compose tools.

ci/install-docker.sh

@@ -1,11 +1,13 @@
 #!/usr/bin/env bash
 
+# See: https://docs.travis-ci.com/user/docker/#using-docker-compose
+# See: https://docs.travis-ci.com/user/docker/#installing-a-newer-docker-version
+# See: https://docs.docker.com/engine/install/ubuntu/#next-steps
 sudo apt-get clean
+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
+sudo apt-get -y -o Dpkg::Options::="--force-confnew" install docker-ce docker-ce-cli containerd.io docker-compose-plugin
+# Print docker and docker compose tool versions.
 docker --version
-sudo rm /usr/local/bin/docker-compose || true
-curl -L https://github.com/docker/compose/releases/download/1.6.2/docker-compose-`uname -s`-`uname -m` > docker-compose
-chmod +x docker-compose
-sudo mv docker-compose /usr/local/bin
-docker-compose --version
+docker compose version

composer.json

@@ -11,7 +11,7 @@
     "homepage": "https://github.com/goalgorilla/open_social_scripts",
     "minimum-stability": "dev",
     "require": {
-        "composer/installers": "^1.0"
+        "composer/installers": "~1.0 || ~2.0"
     },
     "extra": {
         "installer-name": "social"