- increased updaterevision's buffer sizes to prevent GIT_BRANCH from cut short

A little something I stumbled on my own project: a 64 byte array isn't enough to contain the entire git log output, leaving ```GIT_HASH``` truncated. I ran ```git log -1 --format=%ai*%H``` and it yielded this:
```2014-03-27 16:34:32 +0200*d7a2435703f56ce36c00892f31c3a582bb947b7d```

compare this in gitinfo.h:
```#define GIT_HASH "d7a2435703f56ce36c00892f31c3a582bb947"```

notice it's three bytes short. This patch corrects the issue by making the buffers large enough that fgets doesn't have to truncate data. While just a couple more bytes would've done the trick I doubled the sizes of the buffers for extra futureproofing.