Update build tools version (#102)

Author: elliotykim

.travis.yml

@@ -3,7 +3,7 @@ android:
   components:
     - tools
     - platform-tools
-    - build-tools-24.0.3
+    - build-tools-25.0.2
     - android-24
     - doc-24
     - extra-android-m2repository

build.gradle

@@ -48,7 +48,7 @@ allprojects {
 
 ext {
     compile_sdk_version = 24
-    build_tools_version = "25.0.0"
+    build_tools_version = "25.0.2"
     min_sdk_version = 10
     target_sdk_version = 24