chore: set tag file locations

```
set tags=./tags;,tags;
```

Tells Vim to look for a tags file in the directory of the current file
as well as in the working directory, and up, and up, and...

1 files changed, 1 insertions, 1 deletions

diff --git a/vimrc b/vimrc
index 24e3094..0d73e6f 100644
--- a/vimrc
+++ b/vimrc
@@ -53,7 +53,7 @@ set splitright
 set t_Co=256
 set t_vb=
 set tabstop=2
-set tags=./tags;
+set tags=./tags;,tags;
 set title
 set ttyfast
 set updatetime=200