Update metadata for com.agateau.nanonote

Automatically generated:
- Keywords: note taking, minimalist note app, simple note editor

Author: razzeee

src/linux/nanonote.metainfo.xml

@@ -195,4 +195,9 @@
     </screenshot>
   </screenshots>
   <content_rating type="oars-1.1"/>
+  <keywords>
+    <keyword>note taking</keyword>
+    <keyword>minimalist note app</keyword>
+    <keyword>simple note editor</keyword>
+  </keywords>
 </component>