build: uses rimraf and copyfiles so that it also works on windows

Author: JohannesHoppe

src/package-lock.json

@@ -8,7 +8,7 @@
     "ngh": "angular-cli-ghpages"
   },
   "scripts": {
-    "build": "rm -rf dist && json2ts deploy/schema.json > deploy/schema.d.ts && tsc && cp ../README.md builders.json collection.json package.json angular-cli-ghpages dist && cp deploy/schema.json dist/deploy",
+    "build": "rimraf dist && json2ts deploy/schema.json > deploy/schema.d.ts && tsc && copyfiles ../README.md builders.json collection.json package.json angular-cli-ghpages dist && copyfiles deploy/schema.json dist/deploy",
     "test": "jest"
   },
   "schematics": "./collection.json",
@@ -52,8 +52,10 @@
     "@types/fs-extra": "^8.0.0",
     "@types/jest": "^24.0.16",
     "@types/node": "^12.6.9",
+    "copyfiles": "^2.1.1",
     "jest": "^24.8.0",
     "json-schema-to-typescript": "^7.0.0",
+    "rimraf": "^2.6.3",
     "ts-jest": "^24.0.2",
     "typescript": "^3.5.3"
   },