Document credentials

Author: thekid

ChangeLog.md

@@ -3,6 +3,10 @@ AWS Lambda change log
 
 ## ?.?.? / ????-??-??
 
+* Merged PR #18: Make credentials accessible via `credentials()` in
+  `Environment` (instead of having to use *AWS_ACCESS_KEY_ID/...*
+  environment variables).
+  (@thekid)
 * Merged PR #17: Migrate to new testing library - @thekid
 
 ## 4.2.0 / 2022-07-14

README.md

@@ -216,6 +216,7 @@ public class com.amazon.aws.lambda.Environment {
   public function path(string $path): io.Path
   public function tempDir(): io.Path
   public function variable(string $name): ?string
+  public function credentials(): com.amazon.aws.lambda.Credentials
   public function trace(var... $args): void
   public function properties(string $name): util.PropertyAccess
 }