Handle message type 7 (member join)

When message type 7 is received from the gateway, transform the content
if the type is 7 to a proper greeting.

Additionally, when the type is 6, provide a proper content notifying that a
user has pinned a message to the channel.

These transformations are not done at REST-level when retrieving messages, and
are instead done in `ChannelId::message` and `ChannelId::messages`.

1 files changed, 23 insertions, 0 deletions

diff --git a/tests/resources/message_type_7.json b/tests/resources/message_type_7.json
new file mode 100644
index 0000000..823fbad
--- /dev/null
+++ b/tests/resources/message_type_7.json
@@ -0,0 +1,23 @@
+{
+  "type": 7,
+  "tts": false,
+  "timestamp": "2017-01-01T12:00:00.000000+00:00",
+  "pinned": false,
+  "nonce": null,
+  "mentions": [],
+  "mention_roles": [],
+  "mention_everyone": false,
+  "id": "123132131321321",
+  "embeds": [],
+  "edited_timestamp": null,
+  "content": "",
+  "channel_id": "321",
+  "author": {
+    "username": "aaa",
+    "id": "123",
+    "discriminator": "0123",
+    "bot": true,
+    "avatar": "u9aosdu9anbsduas8"
+  },
+  "attachments": []
+}