fix(cdk-dasm): update README and fix small typo (#3565)

Signed-off-by: campionfellin <campionfellin@gmail.com>

Author: campionfellin

packages/cdk-dasm/README.md

@@ -110,5 +110,17 @@ For example, given:
 The output will be:
 
 ```ts
+// generated by cdk-dasm at 2019-08-07T02:52:01.561Z
 
+import { Stack, StackProps, Construct, Fn } from '@aws-cdk/core';
+import sns = require('@aws-cdk/aws-sns');
+
+export class MyStack extends Stack {
+    constructor(scope: Construct, id: string, props: StackProps = {}) {
+        super(scope, id, props);
+        new sns.CfnTopic(this, 'MyTopic', {
+            displayName: "YoTopic",
+        });
+    }
+}
 ```

packages/cdk-dasm/lib/dasm.ts

@@ -46,7 +46,7 @@ export async function dasmTypeScript(template: Template, options: DisassemblerOp
   const timestamp = options.timestamp !== undefined ? options.timestamp : true;
   const suffix = timestamp ?  `at ${new Date().toISOString()}` : '';
 
-  code.line(`// generated by cdk-dasm${suffix}`);
+  code.line(`// generated by cdk-dasm ${suffix}`);
   code.line();
 
   //

packages/cdk-dasm/test/__snapshots__/dasm.test.js.snap

@@ -1,7 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`basic test 1`] = `
-"// generated by cdk-dasm
+"// generated by cdk-dasm 
 
 import { Stack, StackProps, Construct, Fn } from '@aws-cdk/core';
 import sns = require('@aws-cdk/aws-sns');
@@ -18,7 +18,7 @@ export class MyStack extends Stack {
 `;
 
 exports[`bucket-and-key 1`] = `
-"// generated by cdk-dasm
+"// generated by cdk-dasm 
 
 import { Stack, StackProps, Construct, Fn } from '@aws-cdk/core';
 import kms = require('@aws-cdk/aws-kms');
@@ -98,7 +98,7 @@ export class MyStack extends Stack {
 `;
 
 exports[`no props 1`] = `
-"// generated by cdk-dasm
+"// generated by cdk-dasm 
 
 import { Stack, StackProps, Construct, Fn } from '@aws-cdk/core';
 import s3 = require('@aws-cdk/aws-s3');