Update usage section of README

Author: hackermd

README.md

@@ -34,7 +34,8 @@ The viewer can be embedded in any website.
 
 To this end
 
-* Create an instance of the `DICOMMicroscopy` viewer. The constructor requires an instance of `DICOMwebClient` for retrieving frames from the archive as well as the [Study Instance UID](http://dicom.nema.org/medical/dicom/2018b/output/chtml/part03/sect_C.7.2.html#para_a73c2743-6150-4a31-9da7-0d50edb8cd67) and [Series Instance UID](http://dicom.nema.org/medical/dicom/2018b/output/chtml/part03/sect_C.7.3.html#para_b0bcb555-c05c-4c1d-8b7e-8904168a3d38).
+* Create an instance of the `DICOMMicroscopy` viewer. The constructor requires an instance of `DICOMwebClient` for retrieving frames from the archive as well as the metadata for each DICOM image instance formatted according to the [
+DICOM JSON Model](http://dicom.nema.org/medical/dicom/current/output/chtml/part18/sect_F.2.html).
 
 * Call the `render()` method, passing it the HTML element or the name of the element, which shall contain the viewport.