Change name to mu

It turns out that Heirloom troff includes an (m)g macro set for
groff compatibility.

I liked the name mg, because of the association with milligram,
but mu is pretty good too.

(And mu is the symbol for the SI micro prefix, which is even smaller
than milli!)

1 files changed, 1 insertions, 1 deletions

diff --git a/t/ne.t b/t/ne.t
index f0434ae..3665099 100644
--- a/t/ne.t
+++ b/t/ne.t
@@ -1,4 +1,4 @@
-.so g.tmac
+.so u.tmac
 .so t.tmac
 .
 .nr mb 1i