change buildtools for travis

.travis.yml

@@ -13,26 +13,12 @@ android:
     - android-23
 
     # Additional components
-    # - extra-google-google_play_services
     - extra-google-m2repository
     - extra-android-m2repository
     - extra-android-support
-    # - addon-google_apis-google-23
-
-    # Specify at least one system image,
-    # if you need to run emulator(s) during your tests
-    # - sys-img-armeabi-v7a-android-23
-    # - sys-img-x86-android-23
 
   licenses:
      - 'android-sdk-license-.+'
 
-# Emulator Management: Create, Start and Wait
-# before_script:
-#   - echo no | android create avd --force -n test -t android-23 --abi armeabi-v7a
-#   - emulator -avd test -no-audio -no-window &
-#   - android-wait-for-emulator
-#   - adb shell input keyevent 82 &
-
 script:
   - ./gradlew assembleRelease

README.md

@@ -1,4 +1,4 @@
-##「壁上观」是一个Material Design知乎日报阅读app
+##「壁上观」是一个Material Design知乎日报阅读app [![Build Status](https://travis-ci.org/Tneciv/ZhihuDaily.svg?branch=master)](https://travis-ci.org/Tneciv/ZhihuDaily)
 ### [Google play](https://play.google.com/store/apps/details?id=com.tneciv.zhihudaily "Google play")
 
 ### 历史版本：