Build warns when vim is the editor

[Kyle Nitzsche]

vim editor creates swp files for recovery in the same directory as the source file being edited. When editing snapcraft.yaml, a file like this is created: snap/.snapcraft.yaml.swp

This causes the following errors (at least when building in destructive mode):

The 'snap' directory is meant specifically for snapcraft, but it contains the following non-snapcraft-related paths, which is unsupported and will cause unexpected behavior:
- .snapcraft.yaml.swp

If you must store these files within the 'snap' directory, move them to 'snap/local', which is ignored by snapcraft.

Perhaps snapcraft could make and expections for vim swp files.

[Sergio Schvezov (sergiusens)]

This is mostly a warning that files are dropped in there and should not be of concern for iteration