Undeclared `enzyme` peer dependency

[joepie91]

It appears that this library actually requires enzyme to be installed into the project, to be loaded:

Error: Cannot find module 'enzyme/build/ShallowWrapper'
Require stack:
- /home/sven/projects/zapdb-kv/node_modules/enzyme-to-json/utils.js
- /home/sven/projects/zapdb-kv/node_modules/enzyme-to-json/index.js
- /home/sven/projects/zapdb-kv/node_modules/snapshotter/dist/snapshotter.js
- /home/sven/projects/zapdb-kv/tests/storage-encoder/date.js
- /home/sven/projects/zapdb-kv/node_modules/tape/bin/import-or-require.js
- /home/sven/projects/zapdb-kv/node_modules/tape/bin/tape
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
    at Function.Module._load (node:internal/modules/cjs/loader:778:27)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object.<anonymous> (/home/sven/projects/zapdb-kv/node_modules/enzyme-to-json/utils.js:16:23)
    at Module._compile (node:internal/modules/cjs/loader:1101:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:1005:19) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    '/home/sven/projects/zapdb-kv/node_modules/enzyme-to-json/utils.js',
    '/home/sven/projects/zapdb-kv/node_modules/enzyme-to-json/index.js',
    '/home/sven/projects/zapdb-kv/node_modules/snapshotter/dist/snapshotter.js',
    '/home/sven/projects/zapdb-kv/tests/storage-encoder/date.js',
    '/home/sven/projects/zapdb-kv/node_modules/tape/bin/import-or-require.js',
    '/home/sven/projects/zapdb-kv/node_modules/tape/bin/tape'
  ]
}

... however, it is not actually specified as a peerDependency in package.json.