Fixup some react key warning behavior

src/components/AttributionPanel.js

@@ -44,7 +44,7 @@ export class AttributionPanel extends Component {
               <>
                 <Typography variant="subtitle2" component="dt">{t('rights')}</Typography>
                 { rights.map(v => (
-                  <Typography variant="body1" component="dd">
+                  <Typography variant="body1" component="dd" key={v.toString()}>
                     <Link target="_blank" rel="noopener noreferrer" href={v}>
                       {v}
                     </Link>

src/components/CanvasAnnotations.js

@@ -96,7 +96,7 @@ export class CanvasAnnotations extends Component {
                   <div>
                     {
                       annotation.tags.map(tag => (
-                        <Chip size="small" variant="outlined" label={tag} id={tag} className={classes.chip} />
+                        <Chip size="small" variant="outlined" label={tag} id={tag} className={classes.chip} key={tag.toString()} />
                       ))
                     }
                   </div>