Move default branch to main

Author: juliasilge

_output.yml

@@ -17,7 +17,7 @@ bookdown::gitbook:
       after: |
         <li><a href="https://github.com/rstudio/bookdown" target="blank">Published with bookdown</a></li>
     edit:
-      link: https://github.com/juliasilge/tidy-text-mining/edit/master/%s
+      link: https://github.com/juliasilge/tidy-text-mining/edit/main/%s
   includes:
     in_header: _includes/analytics.html