Add write permissions to docs action (#42) #27

Job	Run time
Julia 1.6 - ubuntu-latest - x64	21m 13s
Julia 1.6 - macOS-latest - x64	20m 1s
Julia 1.6 - windows-latest - x64	34m 10s
Julia 1 - ubuntu-latest - x64	11m 47s
Julia 1 - macOS-latest - x64	13m 11s
Julia 1 - windows-latest - x64	13m 46s
Julia nightly - ubuntu-latest - x64	14m 57s
Julia nightly - macOS-latest - x64	16m 18s
Julia nightly - windows-latest - x64	16m 33s
	2h 41m 56s

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