fix migration example

README.md

@@ -95,7 +95,7 @@ Let's wrap our text in an `<h1>` tag.
 m.render(root, m("h1", "My first app"))
 ```
 
-The `m()` function can be used to describe any HTML structure you want. So if you to add a class to the `<h1>`:
+The `m()` function can be used to describe any HTML structure you want. So if you need to add a class to the `<h1>`:
 
 ```javascript
 m("h1", {class: "title"}, "My first app")

docs/change-log.md

@@ -635,11 +635,13 @@ greetAsync()
 ### `v1.x`
 
 ```javascript
-var greetAsync = new Promise(function(resolve){
-    setTimeout(function() {
-        resolve("hello")
-    }, 1000)
-})
+var greetAsync = function() {
+	return new Promise(function(resolve){
+	    setTimeout(function() {
+	        resolve("hello")
+	    }, 1000)
+	})
+}
 
 greetAsync()
     .then(function(value) {return value + " world"})