GH-1187 Fix AWS Context initialization for Custom Runtime

Updated sample to show that Context is not null

Resolves #1187

spring-cloud-function-samples/function-sample-aws-custom/pom.xml

@@ -42,7 +42,11 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter</artifactId>
 		</dependency>
-		
+		<dependency>
+			<groupId>com.amazonaws</groupId>
+			<artifactId>aws-lambda-java-core</artifactId>
+			<version>1.1.0</version>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>