[README.md] change latest release to 2021.2 (openvinotoolkit#3628)

Publishing 2020.3.1 LTS content (openvinotoolkit#3108)

Update SW requirements in build instructions and change latest releas…

…e to 2021.1 (openvinotoolkit#2565)

update system requirements (openvinotoolkit#1321)

* update system requirements

* update release version in readme

change repo name to openvino in readme files

Publishing 2020.2 content

Publishing 2020.1 content

Merge pull request openvinotoolkit#309 from asuhov/2019-r31

Publishing 2019 R3.1 content

Merge pull request openvinotoolkit#278 from asuhov/2019-r3

Publishing 2019 R3 content

Publishing 2019 R2 content (openvinotoolkit#223)