Test

Update course-definition.yml to clarify the `crc` field description. #44

Job	Run time
test_course_definition / docker_lint	8s
test_course_definition / go_lint	4s
test_course_definition / js_lint	15s
test_course_definition / identify_language_slugs	2s
test_course_definition / markdown_lint	18s
test_course_definition / lint	46s
test_course_definition / rust_lint	7s
test_course_definition / validate-schemas	14s
test_course_definition / validate-stages-naming	5s
test_course_definition / verify_templates_compiled	20s
test_course_definition / test (go)	55s
test_course_definition / test (javascript)	31s
test_course_definition / test (python)	32s
test_course_definition / test (rust)	1m 11s
	5m 28s

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