fix: support port number in URI (#10)

Properly handle a URI with port number. (e.g. locally hosted MinIO server)

src/main/java/org/janelia/saalfeldlab/n5/universe/N5Factory.java

@@ -234,7 +234,7 @@ private AmazonS3 createS3(final String uri) {
 			// if AmazonS3URI does not like the form of the uri
 			try {
 				final URI buri = new URI(uri);
-				final URI endpointUrl = new URI(buri.getScheme(), buri.getHost(), null, null);
+				final URI endpointUrl = new URI(buri.getScheme(), null, buri.getHost(), buri.getPort(), null, null, null);
 				return createS3(getS3Credentials(), new EndpointConfiguration(endpointUrl.toString(), null), null, getS3Bucket(uri));
 			} catch (final URISyntaxException e1) {}
 		}