Update HACKING.txt with commit message width hint

diff --git a/HACKING.txt b/HACKING.txt
index 223e635dbdbddd9c96ed64da6a9d98c707e0bd60..c8ce5b03423f569b4db0092ce8d4718cd712826d 100644 (file)
--- a/HACKING.txt
+++ b/HACKING.txt
@@ -42,7 +42,7 @@ Commit messages
   description with a context follow by a colon.
 * The short description should be in "command form" (see examples below).
 * Don't put a final period after the short description.
-* Keep lines in the message at most 80 characters wide.
+* Keep lines in the message at most 75 characters wide.
 
 Example 1: