Fix ASDKgram example #trivial (#700)

- Fix an insta-crash that's caused by Webservice.load method to call its completion block off the main thread.
- Fix incorrect http status code check.
- Bump the deployment target to get the project compiling.

examples_extra/ASDKgram-Swift/ASDKgram-Swift.xcodeproj/project.pbxproj

@@ -428,7 +428,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -478,7 +478,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";

examples_extra/ASDKgram-Swift/ASDKgram-Swift/Webservice.swift

@@ -25,12 +25,13 @@ final class WebService {
 		URLSession.shared.dataTask(with: resource.url) { data, response, error in
 			// Check for errors in responses.
 			let result = self.checkForNetworkErrors(data, response, error)
-
-			switch result {
-			case .success(let data):
-				completion(resource.parse(data))
-			case .failure(let error):
-				completion(.failure(error))
+			DispatchQueue.main.async {
+				switch result {
+				case .success(let data):
+					completion(resource.parse(data))
+				case .failure(let error):
+					completion(.failure(error))
+				}
 			}
 		}.resume()
 	}
@@ -49,7 +50,7 @@ extension WebService {
 			}
 		}
 
-		if let response = response as? HTTPURLResponse, response.statusCode >= 200 && response.statusCode <= 299 {
+		if let response = response as? HTTPURLResponse, response.statusCode <= 200 && response.statusCode >= 299 {
 			return .failure((.invalidStatusCode("Request returned status code other than 2xx \(response)")))
 		}