feat(gitlab: events): add note/snippet - fired when someone comments …

…on snippet

I don't think it will (or should) ever be fired, as there is no such thing as a snippet on a repo...

lib/Gitlab/Events/note-snippet.js

@@ -0,0 +1,32 @@
+const EventResponse = require('../EventResponse');
+
+class NoteSnippet extends EventResponse {
+  constructor(...args) {
+    super(...args, {
+      description: 'This event gets fired when someone comments on a code snippet',
+    });
+  }
+
+  embed(data) {
+    const comment = data.object_attributes;
+    const snippet = data.snippet;
+    return {
+      color: `#996633`,
+      title: `Commented on snippet \`${snippet.title}\``,
+      description: comment.note,
+    };
+  }
+
+  text(data) {
+    const actor = data.user.name;
+    const comment = data.object_attributes;
+    const snippet = data.snippet;
+    return [
+      `**${actor}** commented on snippet **#${snippet.title}**`,
+      `    ${comment.note.slice(0, 100).replace(/\n/g, '\n   ')}`,
+      `${comment.url}`,
+    ].join('\n');
+  }
+}
+
+module.exports = NoteSnippet;