Test

Update course definition to clarify handling of sequential and concur… #36

Job	Run time
test_course_definition / js_lint	17s
test_course_definition / identify_language_slugs	2s
test_course_definition / go_lint	5s
test_course_definition / docker_lint	9s
test_course_definition / lint	47s
test_course_definition / markdown_lint	17s
test_course_definition / rust_lint	7s
test_course_definition / validate-schemas	16s
test_course_definition / validate-stages-naming	7s
test_course_definition / verify_templates_compiled	18s
test_course_definition / test (go)	48s
test_course_definition / test (javascript)	36s
test_course_definition / test (python)	24s
test_course_definition / test (rust)	59s
	5m 12s

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