Added install prompt in config (#120)

* Added prompt before install

Author: shreyashub

configure.sh

@@ -35,6 +35,11 @@ function write_action_env_to_bazelrc() {
 }
 
 [[ -f .bazelrc ]] && rm .bazelrc
+read -r -p "Tensorflow will be upgraded to 2.0. Are You Sure? [Y/n] " reply
+case $reply in
+    [yY]*) echo "Installing...";;
+    * ) echo "Goodbye!"; exit;;
+esac
 pip install $QUIET_FLAG -r requirements.txt
 
 TF_CFLAGS=( $(python -c 'import tensorflow as tf; print(" ".join(tf.sysconfig.get_compile_flags()))') )