Update README to reflect that only Release Candidate has FastMCP feat…

…ures

As mentioned in issue modelcontextprotocol#114, the ReadMe is currently misleading as it specifies a version that does not have the functionality in the  Quickstart and the rest of the documentation.

A quick hotfix, while the MCP team works to release the FastMCP version, would be to add a line in the README.

README.md

@@ -69,13 +69,15 @@ The Model Context Protocol allows applications to provide context for LLMs in a
 
 We recommend using [uv](https://docs.astral.sh/uv/) to manage your Python projects:
 
+FastMCP features are currently only available in the 1.2.0 release candidate version, which can be installed with:
+
 ```bash
-uv add "mcp[cli]"
+uv add "mcp[cli]===1.2.0rc1"
 ```
 
 Alternatively:
 ```bash
-pip install mcp
+pip install "mcp==1.2.0.rc1"
 ```
 
 ## Quickstart
@@ -480,4 +482,4 @@ We are passionate about supporting contributors of all levels of experience and
 
 ## License
 
-This project is licensed under the MIT License - see the LICENSE file for details.
+This project is licensed under the MIT License - see the LICENSE file for details.