message: add -y to apt-get
diff: @@ -4,7 +4,7 @@ if [ $ARCH == "ubuntu" ]; then
  # install dev toolkit
  sudo apt-get update
  wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
  - sudo apt-get install clang-4.0 lldb-4.0 cmake make \
  + sudo apt-get -y install clang-4.0 lldb-4.0 cmake make \
  libbz2-dev libssl-dev libgmp3-dev \
  autotools-dev build-essential \
  libbz2-dev libicu-dev python-dev \
  