Merge branch '109-coverage-badge-does-not-show-percentage' into 'master'

Resolve "Coverage badge does not show percentage"

Closes #109

See merge request mechanics-and-materials/ae108!98

.gitlab-ci.yml

@@ -100,6 +100,7 @@ check-script:
 
 .build-library: &build-library
     stage: build
+    coverage: '/^lines:\s*\d+\.\d+\%/'
     script:
         - useradd developer
         - mkdir build