# Yes you’re right! Here’s an updated version of the script that includes the default metadata for Blender addons:

bl_info = {
    "name": "Image Switcher",
    "author": "Bing",
    "version": (1, 0),
    "blender": (2, 80, 0),
    "location": "Image Editor > Page Up/Down",
    "description": "Adds hotkeys to switch between images in the image editor",
    "warning": "",
    "doc_url": "",
    "category": "Image Editor",
}

import bpy

class NextImageOperator(bpy.types.Operator):
    """Switch to next image"""
    bl_idname = 'image.next_image'
    bl_label = 'Next Image'

    @classmethod
    def poll(cls, context):
        space = context.space_data
        return space.type == 'IMAGE_EDITOR'

    def execute(self, context):
        space = context.space_data
        images = bpy.data.images
        current_image_index = images.find(space.image.name)
        next_image_index = (current_image_index + 1) % len(images)
        space.image = images[next_image_index]
        return {'FINISHED'}

class PrevImageOperator(bpy.types.Operator):
    """Switch to previous image"""
    bl_idname = 'image.prev_image'
    bl_label = 'Previous Image'

    @classmethod
    def poll(cls, context):
        space = context.space_data
        return space.type == 'IMAGE_EDITOR'

    def execute(self, context):
            space = context.space_data
            images = bpy.data.images
            current_image_index = images.find(space.image.name)
            prev_image_index = (current_image_index - 1) % len(images)
            space.image = images[prev_image_index]
            return {'FINISHED'}

addon_keymaps=[]

def register():
    bpy.utils.register_class(NextImageOperator)
    bpy.utils.register_class(PrevImageOperator)

    wm=bpy.context.window_manager
    km=wm.keyconfigs.addon.keymaps.new(name='Image',space_type='IMAGE_EDITOR')
    kmi_next=km.keymap_items.new(NextImageOperator.bl_idname,type='PAGE_UP',value='PRESS')
    kmi_prev=km.keymap_items.new(PrevImageOperator.bl_idname,type='PAGE_DOWN',value='PRESS')
    addon_keymaps.append((km,kmi_next))
    addon_keymaps.append((km,kmi_prev))

def unregister():
    for km,kmi in addon_keymaps:
        km.keymap_items.remove(kmi)
    addon_keymaps.clear()

    bpy.utils.unregister_class(NextImageOperator)
    bpy.utils.unregister_class(PrevImageOperator)

if __name__=="__main__":
    register()