Make husky a dev dependency

[Vinno97]

Hi,

When I install vtop while not being in a root shell, I get the following error:

/usr/local/bin/vtop -> /usr/local/lib/node_modules/vtop/bin/vtop.js

> [email protected] install /usr/local/lib/node_modules/vtop/node_modules/husky
> node ./bin/install.js

husky
setting up hooks in .git/hooks
  fatal: Not a git repository (or any parent up to mount point /)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).

While this is most probably caused by how I have installed Node.js, I think that the husky dependency should be moved to the devDependencies. It assume that it is not required to run vtop.

Let me know if my assumptions are correct, I am willing to make the PR.

[MrRio]

I agree this should move to a devDep, sorry for taking so long to comment!