Update Version in README.md (#5)

Author: smashedr

README.md

@@ -46,7 +46,7 @@ For multiple `keys` and `values` use new lines with a yaml `|`.
 
 ```yaml
 - name: 'Verify JSON'
-  uses: cssnr/json-key-value-check-action@v1
+  uses: cssnr/json-key-value-check-action@v2
   with:
     file: manifest.json
     keys: version
@@ -57,7 +57,7 @@ Same as above but also setting an additional key value pair.
 
 ```yaml
 - name: 'Verify JSON'
-  uses: cssnr/json-key-value-check-action@v1
+  uses: cssnr/json-key-value-check-action@v2
   with:
     file: manifest.json
     keys: |
@@ -72,7 +72,7 @@ Set a nested key and use file from different directory.
 
 ```yaml
 - name: 'Verify JSON'
-  uses: cssnr/json-key-value-check-action@v1
+  uses: cssnr/json-key-value-check-action@v2
   with:
     file: src/manifest.json
     keys: |