docs: update readme for v2 (#706) (#708)

## Description

----

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added appropriate labels to the PR
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/umee-network/umee/blob/main/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

(cherry picked from commit a20eabe)

Co-authored-by: Adam Wozniak <29418299+adamewozniak@users.noreply.github.com>

README.md

@@ -34,6 +34,7 @@ Umee will allow a multitude of decentralized debt products.
 |:-------:|:-------:|:------------:|:-----------:|:-----------:|:-------------:|:--------------------:|
 |  v0.8.x |    ✗    |      ✓       |   v0.45.x   |    v2.0.x   |     v0.2.x    |        v0.1.x        |
 |  v1.x.x |    ✓    |      ✗       |   v0.45.x   |    v2.0.x   |     v0.2.x    |         N/A          |
+|  v2.x.x |    ✗    |      ✓       |   v0.45.x   |    v2.2.x   |     v0.2.x    |        v0.1.x        |
 
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