crunchyroll-rs v0.7.0

• Add CrunchyrollBuilder::device_identifier to specify a custom device id and type
• Make Episode::episode_number an option instead of falling back to default when null
• Add Crunchyroll::active_devices and Crunchyroll::deactivate_all_devices
• Add Device, DeviceLocation and DevicePlatformType
• Rename Crunchyroll::verify_device to Crunchyroll::activate_device
• Add new categories (#25)
• Add CategoryInformation::sub_categories to get all sub-categories of a category
• Add Category::sub_categories to get a list of all categories which are also sub-categories
• Fix url parsing when a language has a - in it
• Add missing api fields