Fix some build script issues

* Copy README to dist
* Fix strings in prepublishOnly

scripts/build/build.js

@@ -200,7 +200,7 @@ async function createPackageJson() {
   delete pkg.devDependencies;
   pkg.scripts = {
     prepublishOnly:
-      'node -e "assert.equal(require(".").version, require("..").version)"'
+      "node -e \"assert.equal(require('.').version, require('..').version)\""
   };
   await util.writeJson("dist/package.json", pkg);
 }
@@ -213,6 +213,8 @@ async function run() {
   }
 
   await createPackageJson();
+
+  await util.copyFile("./README.md", "./dist/README.md");
 }
 
 run();

scripts/build/util.js

@@ -17,8 +17,14 @@ function writeJson(file, content) {
   return writeFile(file, content);
 }
 
+async function copyFile(from, to) {
+  const data = await readFile(from);
+  return writeFile(to, data);
+}
+
 module.exports = {
   asyncRimRaf: promisify(rimraf),
   readJson,
-  writeJson
+  writeJson,
+  copyFile
 };