Update README.md

Author: zengxinzhy

README.md

@@ -82,7 +82,7 @@ If you don't want to use Cocoapods you can still take advantage of the TinyCrayo
 
 #### Download the SDK
 
-1. Download the [TinyCrayon SDK zip](https://www.tinycrayon.com/sdk/iOS/TinyCrayon.zip) (this is a ~6MB file and may take some time).
+1. Download the [TinyCrayon SDK zip](https://www.tinycrayon.com/sdk/iOS/TinyCrayon.zip) (this is a ~20MB file and may take some time).
 2. Unzip the TinyCrayon.zip
 
 #### Add the framework