Bugfix/#55 refactor to atomics #148

Job	Run time
linux-amd64-nim-devel (master)	28s
linux-amd64-nim-version-2-0 (master)	25s
linux-amd64-nim-version-1-6 (master)	24s
macos-amd64-nim-devel (master)	1m 1s
macos-amd64-nim-version-2-0 (master)	1m 37s
macos-amd64-nim-version-1-6 (master)	1m 57s
windows-amd64-nim-devel (master)	3m 42s
windows-amd64-nim-version-2-0 (master)	4m 36s
windows-amd64-nim-version-1-6 (master)	3m 38s
windows-i386-nim-devel (master)	3m 40s
windows-i386-nim-version-2-0 (master)	3m 36s
windows-i386-nim-version-1-6 (master)	4m 10s
	29m 14s

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