deleting ndk after extract

Author: plamen5kov

.travis.yml

@@ -29,6 +29,7 @@ before_install:
   - wget http://dl.google.com/android/repository/android-ndk-$NDK_VERSION-linux-x86_64.zip
   - chmod +x android-ndk-$NDK_VERSION-linux-x86_64.zip
   - "unzip -q android-ndk-$NDK_VERSION-linux-x86_64.zip"
+  - "rm -rf android-ndk-$NDK_VERSION-linux-x86_64.zip"
   - export ANDROID_NDK_HOME=`pwd`/android-ndk-$NDK_VERSION
   - export PATH=${PATH}:${ANDROID_NDK_HOME}
 before_script: