Remove make_new_version.sh
Remove make_new_version.sh

Summary:
Seems the only function of the script is to create a new branch, which can be done easily. I'm removing it.
Closes https://github.com/facebook/rocksdb/pull/2623

Differential Revision: D5468681

Pulled By: yiwu-arbug

fbshipit-source-id: 87dea5ecc4c85e06941ccbc36993f7f589063878

vmx/rocksdb,vmx/rocksdb,vmx/rocksdb,vmx/rocksdb,vmx/rocksdb,vmx/rocksdb,vmx/rocksdb,vmx/rocksdb