Fix "Commitment to Open Source" link in contributing.md

[TyMick]

https://vercel.com/blog/oss redirects to https://vercel.com. Is https://vercel.com/oss the right URL?

[ijjk]

Stats from current PR

Default Server Mode (Increase detected ⚠️)

General

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
buildDuration	13s	12.8s	-144ms
nodeModulesSize	61.8 MB	61.8 MB	✓

Page Load Tests Overall increase ✓

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.403	2.36	-0.04
/ avg req/sec	1040.46	1059.29	⚠️ +18.83
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.537	1.491	-0.05
/error-in-render avg req/sec	1626.77	1677.22	⚠️ +50.45

Client Bundles (main, webpack, commons)

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
main-HASH.js gzip	6.59 kB	6.59 kB	✓
webpack-HASH.js gzip	746 B	746 B	✓
de003c3a9d30..1e23.js gzip	10.5 kB	10.5 kB	✓
framework.HASH.js gzip	39.1 kB	39.1 kB	✓
Overall change	57 kB	57 kB	✓

Client Bundles (main, webpack, commons) Modern

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
main-HASH.module.js gzip	5.67 kB	5.67 kB	✓
webpack-HASH..dule.js gzip	746 B	746 B	✓
de003c3a9d30..dule.js gzip	6.92 kB	6.92 kB	✓
framework.HA..dule.js gzip	39.1 kB	39.1 kB	✓
Overall change	52.5 kB	52.5 kB	✓

Legacy Client Bundles (polyfills)

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
polyfills-HASH.js gzip	26.3 kB	26.3 kB	✓
Overall change	26.3 kB	26.3 kB	✓

Client Pages

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
_app.js gzip	1.26 kB	1.26 kB	✓
_error.js gzip	3.25 kB	3.25 kB	✓
hooks.js gzip	881 B	881 B	✓
index.js gzip	222 B	222 B	✓
link.js gzip	2.06 kB	2.06 kB	✓
routerDirect.js gzip	279 B	279 B	✓
withRouter.js gzip	278 B	278 B	✓
Overall change	8.22 kB	8.22 kB	✓

Client Pages Modern

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
_app.module.js gzip	604 B	604 B	✓
_error.module.js gzip	2.04 kB	2.04 kB	✓
hooks.module.js gzip	383 B	383 B	✓
index.module.js gzip	223 B	223 B	✓
link.module.js gzip	1.52 kB	1.52 kB	✓
routerDirect..dule.js gzip	281 B	281 B	✓
withRouter.m..dule.js gzip	278 B	278 B	✓
Overall change	5.33 kB	5.33 kB	✓

Client Build Manifests

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
_buildManifest.js gzip	61 B	61 B	✓
_buildManife..dule.js gzip	61 B	61 B	✓
Overall change	122 B	122 B	✓

Rendered Page Sizes

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
index.html gzip	927 B	927 B	✓
link.html gzip	937 B	937 B	✓
withRouter.html gzip	924 B	924 B	✓
Overall change	2.79 kB	2.79 kB	✓

---

Serverless Mode

General

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
buildDuration	13.7s	13.5s	-147ms
nodeModulesSize	61.8 MB	61.8 MB	✓

Client Bundles (main, webpack, commons)

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
main-HASH.js gzip	6.59 kB	6.59 kB	✓
webpack-HASH.js gzip	746 B	746 B	✓
de003c3a9d30..1e23.js gzip	10.5 kB	10.5 kB	✓
framework.HASH.js gzip	39.1 kB	39.1 kB	✓
Overall change	57 kB	57 kB	✓

Client Bundles (main, webpack, commons) Modern

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
main-HASH.module.js gzip	5.67 kB	5.67 kB	✓
webpack-HASH..dule.js gzip	746 B	746 B	✓
de003c3a9d30..dule.js gzip	6.92 kB	6.92 kB	✓
framework.HA..dule.js gzip	39.1 kB	39.1 kB	✓
Overall change	52.5 kB	52.5 kB	✓

Legacy Client Bundles (polyfills)

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
polyfills-HASH.js gzip	26.3 kB	26.3 kB	✓
Overall change	26.3 kB	26.3 kB	✓

Client Pages

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
_app.js gzip	1.26 kB	1.26 kB	✓
_error.js gzip	3.25 kB	3.25 kB	✓
hooks.js gzip	881 B	881 B	✓
index.js gzip	222 B	222 B	✓
link.js gzip	2.06 kB	2.06 kB	✓
routerDirect.js gzip	279 B	279 B	✓
withRouter.js gzip	278 B	278 B	✓
Overall change	8.22 kB	8.22 kB	✓

Client Pages Modern

	zeit/next.js canary	tywmick/next.js fix-contributing-link	Change
_app.module.js gzip	604 B	604 B	✓
_error.module.js gzip	2.04 kB	2.04 kB	✓
hooks.module.js gzip	383 B	383 B	✓
index.module.js gzip	223 B	223 B	✓
link.module.js gzip	1.52 kB	1.52 kB	✓
routerDirect..dule.js gzip	281 B	281 B	✓
withRouter.m..dule.js gzip	278 B	278 B	✓
Overall change	5.33 kB	5.33 kB	✓

Client Build Manifests

	zeit/next.js canary	tywmick/next.js fix-contributing-link	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	tywmick/next.js fix-contributing-link	Change
_error.js	844 kB	844 kB	✓
404.html	4.18 kB	4.18 kB	✓
hooks.html	3.81 kB	3.81 kB	✓
index.js	844 kB	844 kB	✓
link.js	882 kB	882 kB	✓
routerDirect.js	874 kB	874 kB	✓
withRouter.js	874 kB	874 kB	✓
Overall change	4.33 MB	4.33 MB	✓

[Timer]

Thanks!