docs: fix ts example (#467)

* docs: fix ts example

Signed-off-by: Grant Timmerman <timmerman+devrel@google.com>

* docs: fix ts example

Signed-off-by: Grant Timmerman <timmerman+devrel@google.com>

* docs: update quote mark

Signed-off-by: Grant Timmerman <timmerman+devrel@google.com>

Author: grant

README.md

@@ -134,24 +134,24 @@ const ce2 = ce.cloneWith({extension: "Value"});
 
 You can create a `CloudEvent` object in many ways, for example, in TypeScript:
 
-```js
+```ts
 import { CloudEvent, CloudEventV1, CloudEventV1Attributes } from "cloudevents";
 const ce: CloudEventV1<string> = {
-    specversion: '1.0',
-    source: '/some/source',
-    type: 'example',
-    id: '1234'
+  specversion: "1.0",
+  source: "/some/source",
+  type: "example",
+  id: "1234"
 };
 const event = new CloudEvent(ce);
 const ce2: CloudEventV1Attributes<string> = {
-    specversion: '1.0',
-    source: '/some/source',
-    type: 'example',
+  specversion: "1.0",
+  source: "/some/source",
+  type: "example",
 };
 const event2 = new CloudEvent(ce2);
 const event3 = new CloudEvent({
-    source: '/some/source',
-    type: 'example',
+  source: "/some/source",
+  type: "example",
 });
 ```