Merge pull request #1089 from ecomfe/fix-npmignore

chore: still publish `build` folder to npm as echarts needs it

Author: Ovilia

.npmignore

@@ -1,7 +1,6 @@
 /doc
 /test
 /benchmark
-/build
 /tsconfig.json
 .github
 .vscode
@@ -12,4 +11,4 @@ Thumbs.db
 Desktop.ini
 
 .eslintignore
-.eslintrc.yaml
+.eslintrc.yaml