[MISC] Fix typo in README.md

[eltociear]

contaner -> container

[CLAassistant]

All committers have signed the CLA.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
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[johannesHarness]

Thanks for the contribution @eltociear :)