updatehub: Bump to 18d0318 revision
updatehub: Bump to 18d0318 revision

This includes following changes:

18d0318 Merge pull request #160 from gustavosbarreto/sort_import_lines
a070073 Sort import lines
ad8ce72 Merge pull request #159 from gustavosbarreto/fix_installifdifferent
02ca621 installifdifferent: ensure only sha256sum is used as string format
45fe20d installifdifferent: update to match package-schema
6482804 Merge pull request #158 from gustavosbarreto/master
c7ad180 FileSha256sum: defer file closing

It also includes a fixup for go-ini library. It has been identified a
problem which happens on 32bit systems[1] and a fix has been sent, so
until it is merged we are applying a fixup here.

 1. https://github.com/go-ini/ini/pull/126

Signed-off-by: Otavio Salvador <1d31b11c1b92bf5d043d36edfe7174db39a6b891@ossystems.com.br>

UpdateHub/meta-updatehub,UpdateHub/meta-updatehub,fbertux/meta-updatehub,fbertux/meta-updatehub,fbertux/meta-updatehub,UpdateHub/meta-updatehub