Need to apt-get install make for local conda build

[RobertBaruch]

In README.md, the instructions need to be updated to:

sudo apt-get install coreutils make

as a fresh docker image of ubuntu has no make.

[RobertBaruch]

(Note that sudo is not used for a docker image, as apparently you get dumped into root anyways)

[RobertBaruch]

Possibly this should be a conda dependency? I've also noted that formal/symbiyosys required binutils (for ar) and cmake to be installed as well.

Edit: it seems Travis-CI doesn't trip over these dependencies, but local docker does. So these should be added to the manual instructions:

./conda-env.sh install binutils cmake

[mithro]

These dependencies should be part of the meta.yaml.