gen-version: prettify source code (#3021)

Author: IvanGoncharov

resources/gen-version.js

@@ -11,7 +11,8 @@ if (!versionMatch) {
 
 const [, major, minor, patch, preReleaseTag] = versionMatch;
 
-const body = `/**
+const body = `
+/**
  * Note: This file is autogenerated using "resources/gen-version.js" script and
  * automatically updated by "npm version" command.
  */
@@ -33,5 +34,5 @@ export const versionInfo = Object.freeze({
 `;
 
 if (require.main === module) {
-  fs.writeFileSync('./src/version.js', body);
+  fs.writeFileSync('./src/version.js', body.trim() + '\n');
 }