Add XEP-0115 to XEP list

Based on a message from JC in the chat.

README.md

@@ -78,6 +78,7 @@ In embedded mode, Converse can be embedded into an element in the DOM.
 - [XEP-0066](https://xmpp.org/extensions/xep-0066.html) Out of Band Data
 - [XEP-0077](https://xmpp.org/extensions/xep-0077.html) In-band registration
 - [XEP-0085](https://xmpp.org/extensions/xep-0085.html) Chat State Notifications
+- [XEP-0115](https://xmpp.org/extensions/xep-0115.html) Entity Capabilities
 - [XEP-0124](https://xmpp.org/extensions/xep-0124.html) Bidirectional-streams Over Synchronous HTTP (BOSH)
 - [XEP-0144](https://xmpp.org/extensions/xep-0144.html) Roster item exchange
 - [XEP-0156](https://xmpp.org/extensions/xep-0156.html) Discovering Alternative XMPP Connection Methods

conversejs.doap

@@ -80,6 +80,13 @@
         <xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0085.html"/>
       </xmpp:SupportedXep>
     </implements>
+    <implements>
+      <xmpp:SupportedXep>
+        <xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0115.html"/>
+        <xmpp:status>partial</xmpp:status>
+        <xmpp:note>advertises caps but no caching</xmpp:note>
+      </xmpp:SupportedXep>
+    </implements>
     <implements>
       <xmpp:SupportedXep>
         <xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0124.html"/>