newest version name makes nbdev_new fails.

There is a bug when creating a new repo with nbdev_new because of the naming of version of nbdev-template v1.1.6 instead of 1.1.6. Folder names are different from the one downloaded and the name it is looking for.

Repex:
https://share.solve.it.com/d/df8f115f5b3bc389310a3fca09c2851a