Update README.md upgrade language (#492)

Setsun · taion · commit 7c0b963d1de9 · 2019-04-22T10:59:06.000-04:00
Include version 2.0.0 and onwards in the breaking API changes
diff --git a/README.md b/README.md
@@ -1,10 +1,10 @@
 # react-transition-group [![npm][npm-badge]][npm]
 
-> **ATTENTION!** To address many issues that have come up over the years, the API in v2 is not backwards compatible with the original [`React addon (v1-stable)`](https://github.com/reactjs/react-transition-group/tree/v1-stable).
+> **ATTENTION!** To address many issues that have come up over the years, the API in v2 and above is not backwards compatible with the original [`React addon (v1-stable)`](https://github.com/reactjs/react-transition-group/tree/v1-stable).
 >
 > **For a drop-in replacement for `react-addons-transition-group` and `react-addons-css-transition-group`, use the v1 release. Documentation and code for that release are available on the [`v1-stable`](https://github.com/reactjs/react-transition-group/tree/v1-stable) branch.**
 >
-> We are no longer updating the v1 codebase, please upgrade to v2 when possible
+> We are no longer updating the v1 codebase, please upgrade to the latest version when possible
 
 A set of components for managing component states (including mounting and unmounting) over time, specifically designed with animation in mind.
 

Original file line number	Diff line number	Diff line change
`@@ -1,10 +1,10 @@`
`1`	`1`	`# react-transition-group [![npm][npm-badge]][npm]`
`2`	`2`
`3`		-> ATTENTION! To address many issues that have come up over the years, the API in v2 is not backwards compatible with the original [`React addon (v1-stable)`](https://github.com/reactjs/react-transition-group/tree/v1-stable).
	`3`	+> ATTENTION! To address many issues that have come up over the years, the API in v2 and above is not backwards compatible with the original [`React addon (v1-stable)`](https://github.com/reactjs/react-transition-group/tree/v1-stable).
`4`	`4`	`>`
`5`	`5`	> For a drop-in replacement for `react-addons-transition-group` and `react-addons-css-transition-group`, use the v1 release. Documentation and code for that release are available on the [`v1-stable`](https://github.com/reactjs/react-transition-group/tree/v1-stable) branch.
`6`	`6`	`>`
`7`		`-> We are no longer updating the v1 codebase, please upgrade to v2 when possible`
	`7`	`+> We are no longer updating the v1 codebase, please upgrade to the latest version when possible`
`8`	`8`
`9`	`9`	`A set of components for managing component states (including mounting and unmounting) over time, specifically designed with animation in mind.`
`10`	`10`