update README.md
Please merge it for 13MD05-90_02_01 if possible and consider this:
I found the following problem: README.md doesn't list the tested Linux distributions and kernel versions, as required according MEN_13MD05-90_SA_0290. BUT: It makes no sense to add this information in the readme, because supported_components.md lists already the Linux distros. ==>
- I will change SA_0290 for next release.
- Please use the updated README.md of this pull request for 02.01
- Please add the kernel versions to supported_components.md (I will make a comment to SA_0355 for this) With this approach, we can keep the README.md release independent whereas supported_components.md and 13MD05-90_changelog.md is release specific.