Add missing copyright header

[kassens]

This made the build fail since there was no file header comment.

[react-sizebot]

Comparing: 0d695be...b8a1825

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.68 kB	6.68 kB	=	1.83 kB	1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	528.27 kB	528.27 kB	=	93.14 kB	93.14 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	+0.05%	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	633.90 kB	633.90 kB	=	111.33 kB	111.33 kB
facebook-www/ReactDOM-prod.classic.js	=	671.68 kB	671.68 kB	=	117.77 kB	117.77 kB
facebook-www/ReactDOM-prod.modern.js	=	661.96 kB	661.96 kB	=	116.21 kB	116.21 kB
oss-experimental/eslint-plugin-react-hooks/index.js	+52.32%	0.37 kB	0.56 kB	+44.26%	0.24 kB	0.35 kB
oss-stable-semver/eslint-plugin-react-hooks/index.js	+52.32%	0.37 kB	0.56 kB	+44.26%	0.24 kB	0.35 kB
oss-stable/eslint-plugin-react-hooks/index.js	+52.32%	0.37 kB	0.56 kB	+44.26%	0.24 kB	0.35 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-experimental/eslint-plugin-react-hooks/index.js	+52.32%	0.37 kB	0.56 kB	+44.26%	0.24 kB	0.35 kB
oss-stable-semver/eslint-plugin-react-hooks/index.js	+52.32%	0.37 kB	0.56 kB	+44.26%	0.24 kB	0.35 kB
oss-stable/eslint-plugin-react-hooks/index.js	+52.32%	0.37 kB	0.56 kB	+44.26%	0.24 kB	0.35 kB

Generated by 🚫 dangerJS against b8a1825