docs: Fix typo

Author: pcjun97

README.md

@@ -17,7 +17,7 @@ Will also add a `.tfswitch.toml` to the home directory to configure the terrafor
 ```yaml
 - uses: pcjun97/action-setup-tfswitch@v1.0.0
   with:
-    github_token: ${{ github.token }}
+    github-token: ${{ github.token }}
 
 - run: tfswitch 1.2.0
 ```
@@ -27,7 +27,7 @@ Alternatively, specify a specific version of tfswitch to install.
 ```yaml
 - uses: pcjun97/action-setup-tfswitch@v1.0.0
   with:
-    github_token: ${{ github.token }}
+    github-token: ${{ github.token }}
     tag: 0.13.1275
 
 - run: tfswitch 1.0.0