feat: add CHANNEL_OBFUSCATED channel flag (#265)

Ref:
discord/discord-api-docs@8466405

Author: TTtie

index.d.ts

@@ -2610,6 +2610,7 @@ declare namespace Dysnomia {
       PINNED:                      2;
       REQUIRE_TAG:                 16;
       HIDE_MEDIA_DOWNLOAD_OPTIONS: 32768;
+      CHANNEL_OBFUSCATED:          131072;
       IS_SPOILER_CHANNEL:          2097152;
     };
     ComponentTypes: {

lib/Constants.js

@@ -222,6 +222,7 @@ module.exports.ChannelFlags = {
     PINNED:                      1 << 1,
     REQUIRE_TAG:                 1 << 4,
     HIDE_MEDIA_DOWNLOAD_OPTIONS: 1 << 15,
+    CHANNEL_OBFUSCATED:          1 << 17,
     IS_SPOILER_CHANNEL:          1 << 21
 };