Migrate Python depencies to Python 3

[jfthuong]

Great Project here!

I found it strange to have dependencies to Python2 to only use it for Git hooks.

I propose to migrate to Python 3 (or at least making it compatible with both Python 2 and Python 3).

• post-merge
• post-checkout

The only thing to update in these scripts is actually the print: print "..." => print("...")

[jfthuong]

... actually, do we really need this Python dependencies for standard users?

Because as it is only used in Git Hooks, it might only targeted for Developers / Contributors, no?

[jfthuong]

Also, need to update version of node-gyp:

Currently: "node-gyp": "^3.6.3" (see package.json)

That version in list of dependencies is very old and only supports Python 2.7, but support of Python 3 has been added in 2019: nodejs/node-gyp@3d1c60a

The node-gyp version v6.0.0 2019-10-04 supports Python 3.x by default.

At the moment of this issue the latest version of node-gyp is 9.0.0 and supports Python 3.10.

@gumptious Do you think we could upgrade the version of node-gyp?

[emergence75]

hmm... i think upgrading node-gyp, could also solve this little problem here
#1075