leave revision 0 line in Portfile

[Marius Schamschula]

+1

Along with adding the size checksum, where missing.

> On Dec 24, 2018, at 10:14 AM, Michael Dickens <michaelld at macports.org> wrote:
> 
> I'm in agreement here about keeping "revision 0" lines & will start implementing this in my ports as they get updates. - MLD
> 
> On Sun, Dec 23, 2018, at 5:54 AM, Mojca Miklavec wrote:
>> Dear Ken,
>> 
>> On Sat, 22 Dec 2018 at 16:49, Ken Cunningham wrote:
>>> 
>>> I would like to propose we stop asking people to remove the "revision 0" line in Portfiles.
>> 
>> I totally agree.
>> 
>> I mean:
>> - if users submit a PR with "revision 0", we should not ask them to
>> remove that line
>> - if users submit a PR with revision removed, we should not ask them
>> to add it back either (at least not until we add that line to all
>> other ports for some well-grounded reasons)
>> - if users forget to change "revision 99" after version increase, we
>> should still ask them to either remove it or change it to 0
>> 
>>> So how about we embrace the "0" and move on to stuff that matters more!!!
>> 
>> +1
>> 
>> Mojca

Marius