add ri field to EXN and XIP messages for version 2.0 KERI

Author: SmithSamuelM

Diff for: src/keri/core/serdering.py

@@ -471,11 +471,11 @@ class Serder:
                 Ilks.bar: FieldDom(alls=dict(v='', t='',d='', i='', dt='',
                         r='',a={}),
                     saids={Saids.d: DigDex.Blake3_256}),
-                Ilks.xip: FieldDom(alls=dict(v='', t='', d='', i="", dt='',
-                                             r='', q={}, a={}),
+                Ilks.xip: FieldDom(alls=dict(v='', t='', d='', i="", ri="",
+                                             dt='', r='', q={}, a={}),
                     saids={Saids.d: DigDex.Blake3_256}),
-                Ilks.exn: FieldDom(alls=dict(v='', t='', d='', i="", x="",
-                        p="", dt='', r='', q={}, a={}),
+                Ilks.exn: FieldDom(alls=dict(v='', t='', d='', i="", ri="",
+                        x="", p="", dt='', r='', q={}, a={}),
                     saids={Saids.d: DigDex.Blake3_256}),
             },
         },