Fix codecov integration (#81) #116

Job	Run time
Julia 1.3 - ubuntu-latest - x64 - push	2m 28s
Julia 1.3 - ubuntu-latest - x86 - push	3m 24s
Julia 1.3 - macOS-latest - x64 - push	3m 45s
Julia 1.3 - windows-latest - x64 - push	8m 14s
Julia 1.3 - windows-latest - x86 - push	5m 53s
Julia 1 - ubuntu-latest - x64 - push	2m 6s
Julia 1 - ubuntu-latest - x86 - push	2m 57s
Julia 1 - macOS-latest - x64 - push	2m 40s
Julia 1 - windows-latest - x64 - push	1m 25s
Julia 1 - windows-latest - x86 - push	3m 37s
Julia nightly - ubuntu-latest - x64 - push	2m 59s
Julia nightly - ubuntu-latest - x86 - push	4m 0s
Julia nightly - macOS-latest - x64 - push	3m 48s
Julia nightly - windows-latest - x64 - push	4m 29s
Julia nightly - windows-latest - x86 - push	4m 36s
	56m 21s

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