I ran python3 -m pip install -U discord.py but it only installed discord.py v0.16.x. How do I install the new discord.py rewrite v1.0? 
I uninstalled the old discord.py using pip uninstall discord.py and re-ran pip to install discord.py, only to get version v0.16.x again instead of the new v1.0 version.
Easy, open Command Prompt and type "pip install discord.py"
If you do that you're most probably going to want "pip install requests"
If the pip command doesn't work, open your python installer and make sure to click on the add to evironment variables option!
That's all your good to go!
Use Visual Studio Code or Atom, they are the best so far that I have used for my bot!
How to install discord.py rewrite?