Phobos v2.054 tag is wrong - Walter's commit isn't in master

[Johann MacDonagh]

After the v2.054 release I did a git fetch and noticed the v2.054 tag 
didn't get pulled in. I started looking at the repo and noticed that the 
v2.054 tag isn't a descendant of a ref (master, etc...) In addition, 
Walter's commit db88b8b6 didn't make it into master.

I've submitted a pull request to fix this (which makes the tag a 
descendant of master and ensures Walter's commit makes it in):
https://github.com/D-Programming-Language/phobos/pull/145