README: fix contact

Author: veghdev

README.md

@@ -108,7 +108,7 @@ We welcome contributions to the project, visit our [wiki page](https://github.co
 
 * Join our Slack: [vizzu-community.slack.com](https://join.slack.com/t/vizzu-community/shared_invite/zt-w2nqhq44-2CCWL4o7qn2Ns1EFSf9kEg)
 * Drop us a line at [email protected]
-* Follow us on twitter: [https://twitter.com/VizzuHQ](https://twitter.com/VizzuHQ)
+* Follow us on Twitter: [https://twitter.com/VizzuHQ](https://twitter.com/VizzuHQ)
 
 # License