v0.15 Remove commented line from SQL syntax

gossamer_forums.rb

@@ -1,5 +1,5 @@
 # gossamer threads migration-import code
-# v0.14
+# v0.15
 
 require 'mysql2'
 require 'open-uri'
@@ -64,7 +64,6 @@ class GossamerForumsImporter < ImportScripts::Base
         old_post_id INTEGER PRIMARY KEY,
         new_url TEXT,
         title TEXT
-#         created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
       );
     SQL
   end