Fix links in QQM graph from master to main

Author: spier

measuring/use_gqm.md

@@ -2,16 +2,16 @@
 
 *An overview of the Goals, Questions, and Metrics (GQM) catalog.*
 
-This page works better in GitHub; [click here](https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/master/measuring/use_gqm.md).
+This page works better in GitHub; [click here](https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/main/measuring/use_gqm.md).
 
 ```mermaid
 graph LR;
     subgraph GQM[Goals, Questions, Metrics]
-        find-projects[<a href='https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/master/measuring/goals/find-projects.md'>Find Projects</a>] --> who-uses[Who Uses]
-        reduce-duplication[<a href='https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/master/measuring/goals/reduce-duplication.md'>Reduce Duplication</a>] --> who-uses[<a href='https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/master/measuring/questions/who-uses.md'>Who Uses</a>]
-        who-uses --> usage-count[<a href='https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/master/measuring/metrics/usage-count.md'>Usage Count</a>]
+        find-projects[<a href='https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/main/measuring/goals/find-projects.md'>Find Projects</a>] --> who-uses[Who Uses]
+        reduce-duplication[<a href='https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/main/measuring/goals/reduce-duplication.md'>Reduce Duplication</a>] --> who-uses[<a href='https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/main/measuring/questions/who-uses.md'>Who Uses</a>]
+        who-uses --> usage-count[<a href='https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/main/measuring/metrics/usage-count.md'>Usage Count</a>]
         find-projects --> who-contributes
-        who-contributes[<a href='https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/master/measuring/questions/who-contributes.md'>Who Contributes</a>] --> code-contributions[<a href='https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/master/measuring/metrics/code-contributions.md'>Code Contributions</a>]
+        who-contributes[<a href='https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/main/measuring/questions/who-contributes.md'>Who Contributes</a>] --> code-contributions[<a href='https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/main/measuring/metrics/code-contributions.md'>Code Contributions</a>]
     end
     subgraph Legend
         direction TB
@@ -35,5 +35,4 @@ Add your goals, questions, and metrics into this graph!  It will help you to see
 You may get new ideas of what metrics answer the questions you have or what additional goals your questions can support.
 See [CONTRIBUTING.md#metrics].
 
-[CONTRIBUTING.md#metrics]: https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/master/CONTRIBUTING.md#metrics
-
+[CONTRIBUTING.md#metrics]: https://github.com/InnerSourceCommons/managing-inner-source-projects/blob/main/CONTRIBUTING.md#metrics