improve default live to accept any AWS credentials (#355)

src/main/scala/zio/s3/package.scala

@@ -22,7 +22,7 @@ import software.amazon.awssdk.services.s3.S3AsyncClient
 import software.amazon.awssdk.services.s3.model.S3Exception
 import zio.nio.file.{ Path => ZPath }
 import zio.s3.S3Bucket.S3BucketListing
-import zio.s3.providers.{ basic, const }
+import zio.s3.providers.const
 import zio.stream.ZStream
 
 import java.net.URI
@@ -31,6 +31,9 @@ import java.util.concurrent.CompletableFuture
 package object s3 {
   type S3Stream[A] = ZStream[S3, S3Exception, A]
 
+  def settings[R](region: Region, cred: ZIO[R, S3Exception, AwsCredentials]): ZLayer[R, S3Exception, S3Settings] =
+    ZLayer(cred.flatMap(S3Settings.from(region, _)))
+
   def live(region: Region, credentials: AwsCredentials, uriEndpoint: Option[URI] = None): Layer[S3Exception, S3] =
     liveZIO(region, const(credentials), uriEndpoint)
 
@@ -45,13 +48,8 @@ package object s3 {
         .flatMap(Live.connect[R](_, provider, uriEndpoint))
     )
 
-  def settings[R](region: Region, cred: ZIO[R, S3Exception, AwsCredentials]): ZLayer[R, S3Exception, S3Settings] =
-    ZLayer(cred.flatMap(S3Settings.from(region, _)))
-
   val live: ZLayer[S3Settings, ConnectionError, S3] = ZLayer.scoped(
-    ZIO.serviceWithZIO[S3Settings](s =>
-      Live.connect(s.s3Region, basic(s.credentials.accessKeyId, s.credentials.secretAccessKey), None)
-    )
+    ZIO.serviceWithZIO[S3Settings](s => Live.connect(s.s3Region, const(s.credentials), None))
   )
 
   def stub(path: ZPath): ZLayer[Any, Nothing, S3] =