Escape hashes in HTTP reaction methods (#1263)
Escape hashes in HTTP reaction methods (#1263)

This alters `Http::create_reaction` and `Http::delete_reaction` to percent-encode hashes in the given `ReactionType` to allow reacting with certain emojis, such as #️⃣, which is composed of the '#' (hash) character and other Unicode characters to create an emoji.  
acdenisSK/serenity,Flat/serenity