nimble develop makes nim unable to import package
I am installing my package using `nimble install` from the package dir

then, in another file in another location on my system (let's call it `testimport.nim`), I import my package using

`import mypkg/myfile`

where `myfile.nim` is part of mypkg. Everything worked OK at this point.

Then I tried using [nimble develop](https://github.com/nim-lang/nimble#nimble-develop) so that I don't need to reinstall mypkg whenever I make a change to mypkg. However, as soon as I type nimble develop in my package dir, the import statement in `testimport.nim` fails and it seems like it can not find the package anymore.

`testimport.nim(1, 13) Error: cannot open 'mypkg/myfile'`

As I previously ran `nimble install` prior to running `nimble develop`, I now have two packages listed by nimble list -i 

`mypkg  [#head, 0.1.0]`

As soon as I uninstall the #head version by typing nimble uninstall mypkg@#head then the import statement works again but it uses the 0.1.0 installed version of mypkg which defeats the purpose of `nimble develop`.

What could be the issue?