Add `jim!`; add CODECOV_TOKEN #2

Job	Run time
Julia 1 - ubuntu-latest	2m 57s
Julia 1 - windows-latest	4m 36s
Julia 1 - macOS-latest	4m 44s
Julia nightly - ubuntu-latest	4m 13s
Julia nightly - windows-latest	6m 28s
Julia nightly - macOS-latest	3m 0s
	25m 58s

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