English update

[jeroenhabets]

Hi,

We've been happy and grateful users of this library. Thanks @Soar360 for translating your readme back then #84 though I noticed it's not been updated since.
NOTE: On NuGet clicking the "[ENGLISH]" link does not work (I think it is supposed to go to Readme.en.md?)

We're now contemplating updating our Redis from 6.2 to 7.0 and I tried to find out which Redis versions you support. I.e. from which version onward is 7.0 supported? And does upgrading your library have any breaking changes?

So to summarize:

• Could you fix the [ENGLISH] link on your NuGet readme?
• Could you update the English Readme.en.md (and ideally keep it up-to-date 😄)
• Could you add a table/info of Redis versions you support? (and for which versions of your package)
• Could you add release notes (CHANGELOG.md), a.o. containing any breaking changes, we'd need to be aware of?

As this may be a bit much to ask...if not, we'll try to figure it out ourselves. Thanks!