Fix codecov integration #114

Job	Run time
Julia 1.3 - ubuntu-latest - x64 - push	2m 38s
Julia 1.3 - ubuntu-latest - x86 - push	3m 41s
Julia 1.3 - macOS-latest - x64 - push	3m 33s
Julia 1.3 - windows-latest - x64 - push	6m 3s
Julia 1.3 - windows-latest - x86 - push	7m 1s
Julia 1 - ubuntu-latest - x64 - push	1m 57s
Julia 1 - ubuntu-latest - x86 - push	2m 37s
Julia 1 - macOS-latest - x64 - push	2m 42s
Julia 1 - windows-latest - x64 - push	3m 26s
Julia 1 - windows-latest - x86 - push	3m 44s
Julia nightly - ubuntu-latest - x64 - push	2m 51s
Julia nightly - ubuntu-latest - x86 - push	3m 46s
Julia nightly - macOS-latest - x64 - push	4m 29s
Julia nightly - windows-latest - x64 - push	4m 32s
Julia nightly - windows-latest - x86 - push	4m 33s
	57m 33s

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