Updates licenses in following locations to match CC-BY-SA-4.0 from README.md added in c41e73fac2d0b64a93a247beec4efa10b1fac8f3 / #433 :
Copyright footer, CC-BY-3.0 to CC-BY-SA-4.0
License file, CC-BY-SA-3.0 to CC-BY-SA-4.0
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Updates licenses in following locations to match
CC-BY-SA-4.0fromREADME.mdadded in c41e73fac2d0b64a93a247beec4efa10b1fac8f3 / #433 :CC-BY-3.0toCC-BY-SA-4.0CC-BY-SA-3.0toCC-BY-SA-4.0Thank you for submitting a Pull Request (PR) to the Cheat Sheet Series.
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This PR covers issue #.
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