updated the readme

README.md

@@ -32,9 +32,11 @@ var result = await png.Compress("cat.jpg");
 result.Output.Url;
 ```
 
+# Version Upgrades
+
 ## Upgrading from V3 to V4
 
-* The namespaces have changed for the extension methods to all reside in the `TinyPng` namespace.
+* The namespaces have changed for the extension methods to all reside in the `TinyPng` namespace. This will avoid needing to bring in two different namespaces.
 * The `CompressFromUrl` method has been removed. This is now available via a new overload for `Compress` which takes in a `Uri` object
 * I've standardised the namespace on `TinyPng`, it was a bit of a mixed bag of casing previously.
 
@@ -139,15 +141,19 @@ var compressAndConvert = await png.Compress("cat.png").Convert(ConvertImageForma
 
 By using the `Wildcard` format, TinyPng will return the best type for the supplied image.
 
-In the scenario that you are converting to an image and loosing transparency, you can specify a background colour to use for the image.
+In the scenario that you are converting to an image and losing transparency, you can specify a background colour to use for the image.
+
+```csharp
+var compressAndConvert = await png.Compress("cat.png").Convert(ConvertImageFormat.Wildcard, "#FF0000");
+```
 
 
 ## Amazon S3 Storage
 
 The result of any compress operation can be stored directly on to Amazon S3 storage. I'd strongly recommend referring to [TinyPNG.com's documentation](https://tinypng.com/developers/reference) with regard to how to configure
 the appropriate S3 access.
 
-If you're going to be storing images for most requests onto S3, then you can pass in an `AmazonS3Configuration` object to the constructor.
+If you're going to be storing images for most requests into S3, then you can pass in an `AmazonS3Configuration` object to the constructor which will be used for all subsequent requests.
 
 ```csharp
 using var png = new TinyPngClient("yourSecretApiKey",
@@ -191,7 +197,7 @@ compressedCat.CompressionCount; // = 5
 
 ## HttpClient
 
-TinyPngClient can take HttpClient, which can be controlled from outside the library.
+TinyPngClient can take HttpClient as constructor overload, the lifetime of which can be controlled from outside the library.
 
 ```csharp
 var httpClient = new HttpClient();