Test

Update course-definition.yml with information about zlib compression #274

Job	Run time
test_course_definition / js_lint	41s
test_course_definition / go_lint	3s
test_course_definition / markdown_lint	42s
test_course_definition / identify_language_slugs	2s
test_course_definition / validate-schemas	43s
test_course_definition / rust_lint	6s
test_course_definition / validate-stages-naming	4s
test_course_definition / verify_templates_compiled	54s
test_course_definition / test (cpp)	1m 13s
test_course_definition / test (go)	57s
test_course_definition / test (haskell)	4m 12s
test_course_definition / test (javascript)	41s
test_course_definition / test (python)	51s
test_course_definition / test (ruby)	55s
test_course_definition / test (rust)	13m 29s
	25m 33s

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