Fix fetchAnnotations getting all morph values

Now using xml2 package to properly parse the query result

resolves #30

Change-Id: I827cae94791f14ce0955352fd64fd7e5683a92e6
diff --git a/DESCRIPTION b/DESCRIPTION
index 24ee9ca..700c473 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -43,7 +43,8 @@
     PTXQC,
     purrr,
     stringr,
-    urltools
+    urltools,
+    xml2
 Suggests:
     lifecycle,
     testthat,