Install 'artifacts' from the shell script

.travis.yml

@@ -36,8 +36,8 @@ jobs:
   include:
     - stage: package
       script: skip
-      #before_deploy:
-      #  - curl -sL https://raw.githubusercontent.com/travis-ci/artifacts/master/install | bash
+      before_deploy:
+        - curl -sL https://raw.githubusercontent.com/travis-ci/artifacts/6b10798/install | bash
       # Configure the conditional deployment
       # https://docs.travis-ci.com/user/deployment/#examples-of-conditional-deployment
       deploy:
@@ -49,7 +49,7 @@ jobs:
     - stage: release
       script: skip
       before_deploy:
-        #- curl -sL https://raw.githubusercontent.com/travis-ci/artifacts/master/install | bash
+        - curl -sL https://raw.githubusercontent.com/travis-ci/artifacts/6b10798/install | bash
         - ./.travis/deploy_script.sh
       deploy:
         provider: releases
@@ -62,6 +62,3 @@ jobs:
           tags: true
           repo: nabeelio/phpvms
           php: '7.2'
-
-addons:
-  artifacts: true