updated GraphCMS brand to Hygraph.

Author: SKOLZ

README.md

@@ -341,7 +341,7 @@
 - [Getting Started with Vuex: Managing State in Vue.js](https://sabe.io/tutorials/getting-started-with-vuex)
 - [Vue2 ACL using CASL](https://medium.com/@sergiy.stotskiy/vue-acl-with-casl-781a374b987a) by Sergii Stotskyi
 - [Vuejs 2.5+ Authentication Tutorial using Auth0](https://www.storyblok.com/tp/how-to-auth0-vuejs-authentication) on Storyblok blog
-- [GraphCMS introduction guide with Vue](https://graphcms.com/docs/introduction/) on GraphCMS
+- [Hygraph introduction guide with Vue](https://hygraph.com/docs/introduction/) on Hygraph
 - [Vue.js debugging in Chrome and VS Code](https://github.com/Microsoft/vscode-recipes/tree/master/vuejs-cli) This recipe shows how to use the Debugger for Chrome extension with VS Code to debug Vue.js applications generated by the Vue CLI.
 - [Getting Started with Vue JS 2 (Video)](https://www.packtpub.com/web-development/getting-started-vue-js-2-video) by Sachin Bhatnagar, Packt. (January 2018)
 - [Building a movie app interface with Vue.js](https://hackernoon.com/building-a-movie-app-interface-with-vue-js-cdc8aeb5db0b)