bskyr 0.3.0

• Adds support for embedded link cards in bs_post(). (#17)
• Adds new function bs_new_embed_external() to support manual setup of external embeds. (#17)
• Adds more control to bs_post() with a new argument created_at to customize times of posts. (#21)
• Attempts to add an aspect ratio to image posts, if the image can be read by magick. (#20)
• Adds support to get a list feed with bs_get_list_feed(). (#26)
• Corrects a bug in parsing of URLs in posts and tagging them as richtext. (#23)
• Adds bs_delete_post() to delete posts.