Merge pull request #211 from GDGoCINHA/fix/issue-209

fix(#209/auth); 중복 email 검증 관련 import 추가

Author: pwc2002

src/main/java/inha/gdgoc/domain/user/controller/UserController.java

@@ -19,6 +19,7 @@
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
 @RequestMapping("/api/v1")