fix getting data docs in class based example

[ilhamwahabi]

Check me if i'm wrong but don't we also need to import fetch from 'isomorphic-unfetch' in class based example too?
Currently it's just in function based component.

Also I think we should access stars from props at first right?

I had test it in CodeSandbox before https://codesandbox.io/s/small-brook-y7gm2

[ijjk]

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	zeit/next.js canary	iwgx/next.js patch-1	Change
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hooks.js gzip	779 B	779 B	✓
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	zeit/next.js canary	iwgx/next.js patch-1	Change
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hooks.module.js gzip	371 B	371 B	✓
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---

Serverless Mode

General

	zeit/next.js canary	iwgx/next.js patch-1	Change
buildDuration	12.8s	12.9s	⚠️ +116ms
nodeModulesSize	48.9 MB	48.9 MB	✓

Client Bundles (main, webpack, commons)

	zeit/next.js canary	iwgx/next.js patch-1	Change
main-HASH.js gzip	6.45 kB	6.45 kB	✓
webpack-HASH.js gzip	746 B	746 B	✓
4952ddcd88e7..54d3.js gzip	4.68 kB	4.68 kB	✓
commons.HASH.js gzip	4.06 kB	4.06 kB	✓
de003c3a9d30..6ef5.js gzip	13.8 kB	13.8 kB	✓
framework.HASH.js gzip	39.5 kB	39.5 kB	✓
Overall change	69.2 kB	69.2 kB	✓

Client Bundles (main, webpack, commons) Modern

	zeit/next.js canary	iwgx/next.js patch-1	Change
main-HASH.module.js gzip	5.43 kB	5.43 kB	✓
webpack-HASH..dule.js gzip	746 B	746 B	✓
4952ddcd88e7..dule.js gzip	5.56 kB	5.56 kB	✓
de003c3a9d30..dule.js gzip	12.6 kB	12.6 kB	✓
framework.HA..dule.js gzip	39.4 kB	39.4 kB	✓
Overall change	63.7 kB	63.7 kB	✓

Legacy Client Bundles (polyfills)

	zeit/next.js canary	iwgx/next.js patch-1	Change
polyfills-HASH.js gzip	4.76 kB	4.76 kB	✓
Overall change	4.76 kB	4.76 kB	✓

Client Pages

	zeit/next.js canary	iwgx/next.js patch-1	Change
_app.js gzip	1.33 kB	1.33 kB	✓
_error.js gzip	4.07 kB	4.07 kB	✓
hooks.js gzip	779 B	779 B	✓
index.js gzip	222 B	222 B	✓
link.js gzip	2.93 kB	2.93 kB	✓
routerDirect.js gzip	283 B	283 B	✓
withRouter.js gzip	282 B	282 B	✓
Overall change	9.89 kB	9.89 kB	✓

Client Pages Modern

	zeit/next.js canary	iwgx/next.js patch-1	Change
_app.module.js gzip	757 B	757 B	✓
_error.module.js gzip	3.06 kB	3.06 kB	✓
hooks.module.js gzip	371 B	371 B	✓
index.module.js gzip	212 B	212 B	✓
link.module.js gzip	2.49 kB	2.49 kB	✓
routerDirect..dule.js gzip	273 B	273 B	✓
withRouter.m..dule.js gzip	272 B	272 B	✓
Overall change	7.43 kB	7.43 kB	✓

Client Build Manifests

	zeit/next.js canary	iwgx/next.js patch-1	Change
_buildManifest.js gzip	61 B	61 B	✓
_buildManife..dule.js gzip	61 B	61 B	✓
Overall change	122 B	122 B	✓

Serverless bundles

	zeit/next.js canary	iwgx/next.js patch-1	Change
_error.js gzip	78.9 kB	78.9 kB	✓
hooks.html gzip	1.07 kB	1.07 kB	✓
index.js gzip	79.1 kB	79.1 kB	✓
link.js gzip	81.3 kB	81.3 kB	✓
routerDirect.js gzip	79.2 kB	79.2 kB	✓
withRouter.js gzip	79.3 kB	79.3 kB	✓
Overall change	399 kB	399 kB	✓

Commit: d2fdcde

[timneutkens]

This is fine, but this page won't be included in nextjs.org/docs as https://nextjs.org/docs/basic-features/data-fetching