Fixing for Swift 3.1 Ubuntu Release Compatibility.

Using response.chain will cause `SIL verification failed` in Swift
3.1.1 Ubuntu 16.04 when building as `swift build -c release`

Author: RockfordWei

PADockerfile_build

@@ -0,0 +1,10 @@
+FROM perfectlysoft/perfectassistant:3.1
+# Perfect-COpenSSL-Linux.git--5093232834563591861/PADockerfile
+RUN apt-get -y update && apt-get install -y libssl-dev
+
+# Perfect-LinuxBridge.git-1581036685432548022/PADockerfile
+RUN apt-get -y update && apt-get install -y uuid-dev
+
+# Perfect-TensorFlow.git--7585565079711099406/PADockerfile
+RUN wget https://storage.googleapis.com/tensorflow/libtensorflow/libtensorflow-cpu-linux-x86_64-1.2.0.tar.gz -O /tmp/tflib.tgz && tar xvf /tmp/tflib.tgz -C /usr/local ./lib/libtensorflow.so && rm /tmp/tflib.tgz
+RUN rm -rf /var/lib/apt/lists/*

Sources/main.swift

@@ -88,36 +88,36 @@ func handler(data: [String:Any]) throws -> RequestHandler {
     let scanner = inceptionModel
     else {
       response.setHeader(.contentType, value: "text/json")
-        .appendBody(string: "{\"value\": \"Invalid Input\"}")
-        .completed()
+        response.appendBody(string: "{\"value\": \"Invalid Input\"}")
+        response.completed()
       return
     }//end
     let jpeg = Data.From(b64)
     guard let data = Data(base64Encoded: jpeg) else {
       response.setHeader(.contentType, value: "text/json")
-        .appendBody(string: "{\"value\": \"Input is not a valid jpeg\"}")
-        .completed()
+        response.appendBody(string: "{\"value\": \"Input is not a valid jpeg\"}")
+        response.completed()
       return
     }//end guard
 
     do {
       let result = try scanner.match(image: data)
       guard result.0 > -1 && result.0 < tags.count else {
         response.setHeader(.contentType, value: "text/json")
-          .appendBody(string: "{\"value\": \"what is this???\"}")
-          .completed()
+          response.appendBody(string: "{\"value\": \"what is this???\"}")
+          response.completed()
         return
       }//end
       let tag = tags[result.0]
       let p = result.1
       response.setHeader(.contentType, value: "text/json")
-        .appendBody(string: "{\"value\": \"Is it a \(tag)? (Possibility: \(p)%)\"}")
-        .completed()
+        response.appendBody(string: "{\"value\": \"Is it a \(tag)? (Possibility: \(p)%)\"}")
+        response.completed()
       print(tag, p)
     }catch {
       response.setHeader(.contentType, value: "text/json")
-        .appendBody(string: "{\"value\": \"\(error)\"}")
-        .completed()
+        response.appendBody(string: "{\"value\": \"\(error)\"}")
+        response.completed()
       print("\(error)")
     }
   }