bump version to v0.7.12 (#205) #276

Job	Run time
Julia lts - macOS-latest - x64 - push	6m 19s
Julia nightly - ubuntu-latest - x64 - push	4m 51s
Julia 1 - windows-latest - x64 - push	6m 56s
Julia nightly - macOS-latest - x64 - push	6m 58s
Julia 1 - macOS-latest - x64 - push	9m 55s
Julia 1 - ubuntu-latest - x64 - push	4m 20s
Julia lts - windows-latest - x64 - push	4m 16s
Julia nightly - windows-latest - x64 - push	6m 33s
Julia lts - ubuntu-latest - x64 - push	2m 49s
	52m 57s

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