Pass `depwarn` in via `julia_args` (#135) #324

Job	Run time
Julia 1.0 - ubuntu-latest - x64 - push	1m 22s
Julia 1.0 - ubuntu-latest - x86 - push	1m 38s
Julia 1.0 - macOS-latest - x64 - push	2m 7s
Julia 1.0 - windows-latest - x64 - push	7m 56s
Julia 1.0 - windows-latest - x86 - push	5m 25s
Julia 1 - ubuntu-latest - x64 - push	34s
Julia 1 - ubuntu-latest - x86 - push	35s
Julia 1 - macOS-latest - x64 - push	1m 22s
Julia 1 - windows-latest - x64 - push	1m 11s
Julia 1 - windows-latest - x86 - push	1m 6s
Julia nightly - ubuntu-latest - x64 - push	36s
Julia nightly - ubuntu-latest - x86 - push	37s
Julia nightly - macOS-latest - x64 - push	1m 19s
Julia nightly - windows-latest - x64 - push	1m 6s
Julia nightly - windows-latest - x86 - push	1m 22s
	28m 16s

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