fix composer package name

fix composer package name in `composer create-project`

Author: phager-at

docs/TravisFileExplained.md

@@ -98,7 +98,7 @@ before_install:
 # directories to build the project.
   - cd ../..
 # Install this project into a directory called "ci".
-  - composer create-project -n --no-dev --prefer-dist moodlehq/plugin-ci ci ^3
+  - composer create-project -n --no-dev --prefer-dist moodlehq/moodle-plugin-ci ci ^3
 # Update the $PATH so scripts from this project can be called easily.
   - export PATH="$(cd ci/bin; pwd):$(cd ci/vendor/bin; pwd):$PATH"