README: Add a note on additional steps after running guix pull.

Julien LepillerMon Aug 26 15:39:15+0200 2019

5cc9ce1

README: Add a note on additional steps after running guix pull. * README: Add a note for checks after running guix pull.

README.md

3131 
3232 
Then run `guix pull` to pull the new channel.
3333 
34+
### Important checks ###
35+
36+
Make sure your guix environment is set up properly. You need to have
37+
`~/.config/guix/current` as the **first** item in your `$PATH` or you're going
38+
to run into troubles. Additionnaly, after running `guix pull`, make sure you
39+
run `hash guix` in any open terminal to make sure bash's cache is cleared of
40+
the old guix binary location.
41+
3442 
Usage
3543 
-----
3644