fix(@schematics/angular): dasherize library package name

Fix angular#11017

Author: filipesilva

packages/schematics/angular/library/index.ts

@@ -187,7 +187,7 @@ export default function (options: LibraryOptions): Rule {
     validateProjectName(options.name);
 
     // If scoped project (i.e. "@foo/bar"), convert projectDir to "foo/bar".
-    const packageName = options.name;
+    const packageName = strings.dasherize(options.name);
     let scopeName = null;
     if (/^@.*\/.*/.test(options.name)) {
       const [scope, name] = options.name.split('/');