Fixed error in gulp task test

Closes: simcaq/SCRUM#68

.gitlab-ci.yml

@@ -8,6 +8,7 @@ before_script:
 run_tests:
   stage: test
   script:
+    - gulp build
     - gulp test
   tags:
     - node

gulpfile.babel.js

@@ -58,7 +58,7 @@ gulp.task('doc', (cb) => {
     .pipe(jsdoc(config, cb));
 });
 
-gulp.task('test', ['build'], () => {
+gulp.task('test', () => {
     process.chdir('build');
     gulp.src('test/test.js', {read: false})
     .pipe(mocha())