Document minimum access level for authentication token

[vishalovercome]

I get the following error for the main as well as sub-projects which I presume might be due to insufficient access granted at the time of token creation:

[error] (XXX / changeLog) java.lang.IllegalStateException: Got 401 Unauthorized changeLog [error] java.lang.IllegalStateException: Got 401 Unauthorized [error] at org.thp.ghcl.Github$.$anonfun$getMilestones$1(Github.scala:121) [error] at scala.util.Either.fold(Either.scala:192) [error] at org.thp.ghcl.Github$.getMilestones(Github.scala:123) [error] at org.thp.ghcl.SbtGithubChangelogPlugin$.$anonfun$projectSettings$14(SbtGithubChangelogPlugin.scala:68) [error] at scala.Function1.$anonfun$compose$1(Function1.scala:49) [error] at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62) [error] at sbt.std.Transform$$anon$4.work(Transform.scala:68) [error] at sbt.Execute.$anonfun$submit$2(Execute.scala:282) [error] at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:23) [error] at sbt.Execute.work(Execute.scala:291) [error] at sbt.Execute.$anonfun$submit$1(Execute.scala:282) [error] at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265) [error] at sbt.CompletionService$$anon$2.call(CompletionService.scala:64) [error] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) [error] at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [error] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) [error] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [error] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [error] at java.base/java.lang.Thread.run(Thread.java:834) [error] Caused by: sttp.client.HttpError: statusCode: 401, response: {"message":"Bad credentials","documentation_url":"https://docs.github.com/graphql"}