fix: example links in readme

Author: devrnt

examples/README.md

@@ -4,5 +4,5 @@ You can view the source code for the examples within their folder, or visit the
 
 | Name   | Link                                                                                |
 | ------ | ----------------------------------------------------------------------------------- |
-| Gatsby | https://codesandbox.io/s/github/devrnt/react-use-wizard/tree/master/examples/gatsby |
-| NextJS | https://codesandbox.io/s/github/devrnt/react-use-wizard/tree/master/examples/nextjs |
+| Gatsby | https://codesandbox.io/s/github/devrnt/react-use-wizard/tree/main/examples/gatsby |
+| NextJS | https://codesandbox.io/s/github/devrnt/react-use-wizard/tree/main/examples/nextjs |