add spring enviroment extension module

spring-cloud-alibaba-examples/sms-example/pom.xml

@@ -31,6 +31,11 @@
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-alicloud-sms</artifactId>
         </dependency>
+        <dependency>
+            <groupId>alibaba.com</groupId>
+            <artifactId>env-extension</artifactId>
+            <version>0.1.2.BUILD-SNAPSHOT</version>
+        </dependency>
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>