Update pub barback dependency to allow 0.15.1-dev.

Update pub barback dependency to allow 0.15.1-dev.

R=sgjesse@google.com

Committed: https://code.google.com/p/dart/source/detail?r=39486

[Søren Gjesse, 2014-08-22 11:00:36]

lgtm

[Lasse Reichstein Nielsen, 2014-08-22 11:02:25]

Committed patchset #1 manually as 39486 (presubmit successful).

[nweiz, 2014-08-22 18:20:06]

Woah, this isn't okay. Barback's version has the -dev flag because it's not
ready to be released. We don't know what additional changes we'll make before
that release. The current version of pub is *not* compatible with those changes,
which means that when we actually release barback 0.15.1 it will break with all
pub versions that have this constraint.

[Lasse Reichstein Nielsen, 2014-08-22 19:31:34]

On 2014/08/22 18:20:06, nweiz wrote:
> Woah, this isn't okay. Barback's version has the -dev flag because it's not
> ready to be released.

It has the -dev flag because I added it when I changed its version dependency on
package:collection (https://codereview.chromium.org/463333004/).
If there is another way to get to the same point, without tests failing, I'm all
for changing them back. I haven't pushed anything to pub yet.

> We don't know what additional changes we'll make before
> that release. The current version of pub is *not* compatible with those
changes,
> which means that when we actually release barback 0.15.1 it will break with
all
> pub versions that have this constraint.

That is a problem. What would the best solution be?

[Søren Gjesse, 2014-08-25 07:03:56]

On 2014/08/22 19:31:34, Lasse Reichstein Nielsen wrote:
> On 2014/08/22 18:20:06, nweiz wrote:
> > Woah, this isn't okay. Barback's version has the -dev flag because it's not
> > ready to be released.
> 
> It has the -dev flag because I added it when I changed its version dependency
on
> package:collection (https://codereview.chromium.org/463333004/).
> If there is another way to get to the same point, without tests failing, I'm
all
> for changing them back. I haven't pushed anything to pub yet.
> 
> > We don't know what additional changes we'll make before
> > that release. The current version of pub is *not* compatible with those
> changes,
> > which means that when we actually release barback 0.15.1 it will break with
> all
> > pub versions that have this constraint.
> 
> That is a problem. What would the best solution be?

As Lasse added the -dev flag the only change is the collection dependency. Can't
we just release barback 0.15.1 then?