Fixed the GitLab CI YAML

.gitlab-ci.yml

@@ -1,27 +1,28 @@
+---
 .defaults: &defaults
-	before_script:
+  before_script:
-		- sudo apk add --update ragel=6.9
+    - sudo apk add --update ragel=6.9
-		- gem install bundler --no-ri --no-rdoc
+    - gem install bundler --no-ri --no-rdoc
-		- ruby --version
+    - ruby --version
-		- gem --version
+    - gem --version
-		- bundle --version
+    - bundle --version
-		- bundle install -j $(nproc) --path vendor --retry=3
+    - bundle install -j $(nproc) --path vendor --retry=3
-	script:
+  script:
-		- bundle exec rake
+    - bundle exec rake
-	cache:
+  cache:
-		paths:
+    paths:
-			- vendor/ruby
+      - vendor/ruby
 
 Ruby 2.2:
-	image: "ruby:2.2-alpine"
+  image: "ruby:2.2-alpine"
   <<: *defaults
 
 Ruby 2.3:
-	image: "ruby:2.3-alpine"
+  image: "ruby:2.3-alpine"
   <<: *defaults
 
 Ruby 2.4:
-	image: "ruby:2.4-alpine"
+  image: "ruby:2.4-alpine"
   <<: *defaults
 
 JRuby 9.1: