Release 4.3.1

• Adds support for findOne(), findOneAndUpdate(), findOneAndReplace(), and findOneAndDelete() on RemoteMongoCollection.
• Fixes a bug where logging into an anonymous user would sometimes fail with an unhandled promise rejection.
• Prevents users from calling logoutUser() and removeUser() with an argument in StitchAuth, to avoid accidentally logging out or deleting the active user when they meant to log out or delete another user.
• Adds a copy-to-clipboard button in the code snippets in the generated documentation.
• Fixes various linter errors in the codebase.