Update README.md

Author: msnodeve

README.md

@@ -1,7 +1,7 @@
 # Github For Developer
 ![Build Status](https://travis-ci.org/msnodeve/Github-for-Developer.svg?branch=master)
 
-<a href='https://play.google.com/store/apps/details?id=com.seok.gitfordeveloper&pcampaignid=MKT-Other-global-all-co-prtnr-py-PartBadge-Mar2515-1'><img alt='다운로드하기 Google Play' src='https://play.google.com/intl/ko/badges/images/generic/ko_badge_web_generic.png' width="20%"/></a>
+<a href='https://play.google.com/store/apps/details?id=com.seok.gitfordeveloper&pcampaignid=MKT-Other-global-all-co-prtnr-py-PartBadge-Mar2515-1'><img alt='다운로드하기 Google Play' src='https://play.google.com/intl/ko/badges/images/generic/ko_badge_web_generic.png' width="15%"/></a>
 
 ***
 
@@ -19,3 +19,5 @@ v0.6.2 릴리즈 작업 완료
 - Backend 작업
 - UX/UI 개선 작업
 - 자동 로그인 구현
+
+유저들과 서로 소통할 수 있기 위한 Backend 작업 중