Change references from master to main

Author: spier

CONTRIBUTING.md

@@ -37,11 +37,11 @@ When using titles in Markdown, use # for main title, ## for the second header ti
 At that time this manual step will no longer be needed.
 
 [Goal-Question-Metric]: https://en.wikipedia.org/wiki/GQM
-[goals]: https://github.com/InnerSourceCommons/managing-inner-source-projects/tree/master/measuring/goals
-[questions]: https://github.com/InnerSourceCommons/managing-inner-source-projects/tree/master/measuring/questions
-[metrics]: https://github.com/InnerSourceCommons/managing-inner-source-projects/tree/master/measuring/metrics
-[goal template]: https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/master/measuring/goals/gqm_goal_template.md
-[question template]: https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/master/measuring/questions/gqm_question_template.md
-[metric template]: https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/master/measuring/metrics/gqm_metric_template.md
-[edit the MermaidJS source]: https://github.com/InnerSourceCommons/managing-inner-source-projects/edit/master/measuring/use_gqm.md
-[graph]: https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/master/measuring/use_gqm.md
+[goals]: https://github.com/InnerSourceCommons/managing-inner-source-projects/tree/main/measuring/goals
+[questions]: https://github.com/InnerSourceCommons/managing-inner-source-projects/tree/main/measuring/questions
+[metrics]: https://github.com/InnerSourceCommons/managing-inner-source-projects/tree/main/measuring/metrics
+[goal template]: https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/main/measuring/goals/gqm_goal_template.md
+[question template]: https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/main/measuring/questions/gqm_question_template.md
+[metric template]: https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/main/measuring/metrics/gqm_metric_template.md
+[edit the MermaidJS source]: https://github.com/InnerSourceCommons/managing-inner-source-projects/edit/main/measuring/use_gqm.md
+[graph]: https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/main/measuring/use_gqm.md

README.md

@@ -12,7 +12,7 @@ within this respect in a way that this is useful for third parties. For this, we
 actively looking for reviewers that can help in this process.
 For those that have already contributed to the book, thanks a lot!
 
-You can find more information about the process in the [contributing section](https://github.com/dicortazar/managing-inner-source-projects/blob/master/CONTRIBUTING.md).
+You can find more information about the process in the [contributing section](https://github.com/dicortazar/managing-inner-source-projects/blob/main/CONTRIBUTING.md).
 
 ## Who is fostering this initiative?