message: plugin-video: remove migratable
diff: import {
  string,
  object,
  - migratable,
  EditorPluginProps,
  EditorPlugin
  } from '@edtr-io/plugin'
  import { VideoEditor } from './editor'
  -const stateV0 = string()
  -const stateV1 = object({ src: string(), alt: string() })
  /** @public */
  -export const videoState = migratable(stateV0).migrate(stateV1, src => {
  - return { src, alt: '' }
  -})
  +export const videoState = object({ src: string(), alt: string() })
  /** @public */
  export type VideoState = typeof videoState
  /** @public */
  @@ -30,7 +25,7 @@ export function createVideoPlugin(): EditorPlugin<VideoState> {
  const regex = /^(https?:\/\/)?(.*?(youtube\.com\/watch\?(.*&)?v=.+|youtu\.be\/.+|vimeo\.com\/.+|upload\.wikimedia\.org\/.+(\.webm|\.ogg)?|br\.de\/.+))/
  if (regex.test(value)) {
  - return { state: value }
  + return { state: { src: value, alt: '' } }
  }
  }
  }
  