Update readme

Author: fwal

README.md

@@ -31,21 +31,29 @@ To run the action with the latest swift version available, simply add the action
 After the environment is configured you can run swift commands using the standard [`run`](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/workflow-syntax-for-github-actions#jobsjob_idstepsrun) step:
 
 ```yaml
-- uses: swift-actions/setup-swift@v2
+- uses: swift-actions/setup-swift@v3
 - name: Get swift version
   run: swift --version # Swift 6.2
 ```
 
 A specific Swift version can be set using the `swift-version` input:
 
 ```yaml
-- uses: swift-actions/setup-swift@v2
+- uses: swift-actions/setup-swift@v3
   with:
     swift-version: "5.1"
 - name: Get swift version
   run: swift --version # Swift 5.1.0
 ```
 
+Also works with snapshots:
+
+```yaml
+- uses: swift-actions/setup-swift@v3
+  with:
+    swift-version: "main-snapshot"
+```
+
 Works perfect together with matrixes:
 
 ```yaml
@@ -56,7 +64,7 @@ strategy:
     os: [ubuntu-latest, macos-latest]
     swift: ["5.4.3", "5.2.4"]
 steps:
-  - uses: swift-actions/setup-swift@v2
+  - uses: swift-actions/setup-swift@v3
     with:
       swift-version: ${{ matrix.swift }}
   - name: Get swift version
@@ -78,15 +86,15 @@ If you are running on a runner that is not able to verify the GPG signature of t
 YAML interprets eg. `5.0` as a float, this action will then interpret that as `5` which will result in eg. Swift 5.5 being resolved. Quote your inputs! Thus:
 
 ```
-- uses: swift-actions/setup-swift@v2
+- uses: swift-actions/setup-swift@v3
   with:
     swift-version: '5.0'
 ```
 
 Not:
 
 ```
-- uses: swift-actions/setup-swift@v2
+- uses: swift-actions/setup-swift@v3
   with:
     swift-version: 5.0
 ```