Remove node example removes line instead of adding empty statement (#11)

* 🐛 fix(remove-node): remove statement instead of replacing it for an empty statement

* 🔩 chore(example): generate example after changing implementation on remove-node transformer

Author: oscard0m

example-transformers/remove-node/transformed/source.js

@@ -1,2 +1 @@
-;
 console.log(lodash);

example-transformers/remove-node/transformer.ts

@@ -4,7 +4,7 @@ const transformer: ts.TransformerFactory<ts.SourceFile> = context => {
   return sourceFile => {
     const visitor = (node: ts.Node): ts.Node => {
       if (ts.isImportDeclaration(node)) {
-        return ts.createEmptyStatement();
+        return undefined;
       }
 
       return ts.visitEachChild(node, visitor, context);