v0.7.4

Breaking Changes:

• Clients::Base#submit is now moved to Subreddit#submit.

Added:

• #get_related and #get_duplicates for Submission.
• Upload images to a subreddit with Subreddit#upload_image.

Bugfixes:

• Subreddit#admin_edit now merges correctly.
• Clients::Base#stream now escapes common errors to avoid losing track of comments. Non-trivial errors are still unescaped.
• Objects::Base#delete is now Objects::Base#delete_path to avoid collision with Hash#delete.