Compilation terminated
Hi,

I cannot pip install the package. I have

>   regex_3/_regex.c:48:10: fatal error: Python.h: No such file or directory
   #include "Python.h"
            ^~~~~~~~~~
  compilation terminated.
  error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

Might have something to do with CI failure for the new merge.
managed to install it by running 

> sudo apt-get install python3 python-dev