Fix typo in SDK README (#335)

Fixes a spelling typo in the SDK's README.

Author: SiegfriedEhret

README.md

@@ -16,7 +16,7 @@ The best way to get started working with the SDK is to use `go get` to add the S
 go get github.com/aws/aws-sdk-go-v2
 ```
 
-Without Go Modules, or in a GOPATH with Go 1.11 or 1.12 use the `/...` suffix on the `go get` to retrieve all of the SDK's depdnencies.
+Without Go Modules, or in a GOPATH with Go 1.11 or 1.12 use the `/...` suffix on the `go get` to retrieve all of the SDK's dependencies.
 
 ```sh
 go get github.com/aws/aws-sdk-go-v2/...