Add .wav audio as supported file type

app/soapbox/reducers/__tests__/media_attachments-test.js

@@ -16,6 +16,7 @@ describe('media_attachments reducer', () => {
         '.mov',
         '.mp3',
         '.ogg',
+        '.wav',
         'image/jpeg',
         'image/png',
         'image/gif',
@@ -26,6 +27,7 @@ describe('media_attachments reducer', () => {
         'audio/mp3',
         'audio/mpeg',
         'audio/ogg',
+        'audio/wav',
       ]),
     }));
   });

app/soapbox/reducers/media_attachments.js

@@ -18,6 +18,7 @@ const initialState = ImmutableMap({
     '.mov',
     '.mp3',
     '.ogg',
+    '.wav',
     'image/jpeg',
     'image/png',
     'image/gif',
@@ -28,6 +29,7 @@ const initialState = ImmutableMap({
     'audio/mp3',
     'audio/mpeg',
     'audio/ogg',
+    'audio/wav',
   ]),
 });