Merge pull request #38 from tuncer/gitlab-ci

gitlab-ci: test with Erlang 20
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index aece340..ddcf8dd 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-# Copyright (c) 2016 Tuncer Ayaz
+# Copyright (c) 2016-2017 Tuncer Ayaz
 #
 # Permission to use, copy, modify, and/or distribute this software for any
 # purpose with or without fee is hereby granted, provided that the above
@@ -21,7 +21,6 @@
     - .rebar/triq_*_plt
 
 .build_job_template: &build_job_definition
-  image: erlang:17
   stage: build
   script:
     - make
@@ -36,6 +35,7 @@
 
 default-build:
   <<: *build_job_definition
+  image: erlang:17
   artifacts:
     name: "$CI_PROJECT_NAME-ci-${CI_BUILD_REF_NAME}"
     <<: *artifact_paths_defitinion
@@ -45,6 +45,7 @@
 
 release:
   <<: *build_job_definition
+  image: erlang:17
   artifacts:
     name: "$CI_PROJECT_NAME-${CI_BUILD_REF_NAME}"
     <<: *artifact_paths_defitinion
@@ -69,3 +70,7 @@
 test:19:
   <<: *test_job_definition
   image: erlang:19
+
+test:20:
+  <<: *test_job_definition
+  image: erlang:20