Add link to legacy/vue-v2 branch

Author: lukaszflorczak

README.md

@@ -18,7 +18,7 @@ If you like the component remember to **star it** ⭐️. If you appreciate my w
 
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-😔 **Hey! Unfortunately, I have to inform you that currently, due to my private responsibilities (👶👶) and other projects in which I invest my time, I am not able to regularly develop vue-agile, and especially prepare a version for Vue 3. If there is someone among you who would like to take care of the project and continue working, please contact me (https://twitter.com/lukaszflorczak). At the same time, thanks to everyone for all the support so far and the use of vue-agile.**
+🔭 If you're looking for Vue 2 version, check **[legacy/vue-v2](https://github.com/lukaszflorczak/vue-agile/tree/legacy/vue-v2)** branch.
 
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