Replace checksums with `Base.donotdelete` #268

Job	Run time
Documentation	2m 55s
Julia 1.0 - ubuntu-latest - x64 - pull_request	1m 1s
Typos	6s
Julia 1.0 - macOS-latest - x64 - pull_request	1m 29s
Julia 1.0 - windows-latest - x64 - pull_request	3m 48s
Julia 1.6 - ubuntu-latest - x64 - pull_request	1m 3s
Julia 1.6 - macOS-latest - x64 - pull_request	1m 58s
Julia 1 - ubuntu-latest - x64 - pull_request	1m 18s
Julia 1 - macOS-latest - x64 - pull_request	1m 35s
Julia 1 - windows-latest - x64 - pull_request	2m 37s
Julia nightly - ubuntu-latest - x64 - pull_request	5m 10s
Julia nightly - macOS-latest - x64 - pull_request	8m 40s
Julia nightly - windows-latest - x64 - pull_request	4m 43s
	36m 23s

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