Update README for latest code

README.md

@@ -10,23 +10,23 @@ Create an AWSSigner object. Initialise it with security credentials for accessin
 The following example code creates a signed URL to access a file in S3.
 
 ```
-let credentials = Credential(accessKeyId: "MYACCESSKEY", secretAccessKey: "MYSECRETACCESSKEY")
+let credentials = StaticCredential(accessKeyId: "MYACCESSKEY", secretAccessKey: "MYSECRETACCESSKEY")
 let signer = AWSSigner(credentials: credentials, name: "s3", region: "us-east-1")
-let signedURL = AWSSigner.signURL(
-                    url: URL(string:"mybucket.s3.us-east-1.amazonaws.com/myfile")!, 
+let signedURL = signer.signURL(
+                    url: URL(string:"mybucket.s3.us-east-1.amazonaws.com/myfile")!,
                     method: .GET)
 ```
 
 Alternatively you can store the authentication details in the request headers. The following returns the headers required to sign a request plus the original headers. The signature is stored in the 'Authorization' header. This request will return a response containing a list of SNS Topics from AWS region us-east-1.
 
 ```
-let credentials = Credential(accessKeyId: "MYACCESSKEY", secretAccessKey: "MYSECRETACCESSKEY")
+let credentials = StaticCredential(accessKeyId: "MYACCESSKEY", secretAccessKey: "MYSECRETACCESSKEY")
 let signer = AWSSigner(credentials: credentials, name: "sns", region: "us-east-1")
 let body = "Action=ListTopics&Version=2010-03-31"
-let signedHeaders = AWSSigner.signHeaders(
-                  url: URL(string:"sns.us-east-1.amazonaws.com/")!, 
-                  method: .GET, 
-                  headers: ["Content-Type": "application/x-www-form-urlencoded; charset=utf-8"], 
+let signedHeaders = signer.signHeaders(
+                  url: URL(string:"sns.us-east-1.amazonaws.com/")!,
+                  method: .GET,
+                  headers: ["Content-Type": "application/x-www-form-urlencoded; charset=utf-8"],
                   body: .string(body))
 ```
 
@@ -35,19 +35,20 @@ The library includes extensions to the HTTPClient of [AsyncHttpClient](https://g
 
 Both `HTTPClient.awsURLSignedRequest()` and `HTTPClient.awsHeaderSignedRequest()` will create a signed Request that can be sent to AWS via the HTTPClient from AsyncHttpClient. The following creates a signed S3 Request to upload a file to an S3 bucket and processes it. 
 ```
-let credentials = Credential(accessKeyId: "MYACCESSKEY", secretAccessKey: "MYSECRETACCESSKEY")
+let credentials = StaticCredential(accessKeyId: "MYACCESSKEY", secretAccessKey: "MYSECRETACCESSKEY")
 let signer = AWSSigner(credentials: credentials, name: "s3", region: "us-east-1")
 let body = "FileContents"
 let request = try HTTPClient.awsURLSignedRequest(
-                    url: URL(string:"mybucket.s3.us-east-1.amazonaws.com/mynewfile")!, 
-                    method: .PUT, 
+                    url: URL(string:"mybucket.s3.us-east-1.amazonaws.com/mynewfile")!,
+                    method: .PUT,
                     body: .string(body),
                     signer: signer)
 let client = HTTPClient(eventLoopGroupProvider: .createNew)
 client.execute(request: request).whenComplete { result in
     switch result {
     case .failure(let error):
         // process error
+        break
     case .success(let response):
         if response.status == .ok {
             // handle response