feat: add mit license to the published package (#432)

Author: tenphi

.changeset/witty-garlics-lay.md

@@ -0,0 +1,5 @@
+---
+'@cube-dev/ui-kit': minor
+---
+
+Add license field to the published package.json

scripts/copy-files.js

@@ -22,6 +22,7 @@ function copyPackageJson() {
     keywords,
     repository,
     sideEffects,
+    license,
   } = JSON.parse(packageData);
   const newPackageData = {
     name,
@@ -34,6 +35,7 @@ function copyPackageJson() {
     sideEffects,
     peerDependencies,
     dependencies,
+    license,
     module: './es/index.js',
     types: './types/index.d.ts',
     main: './cjs/index.js',