msgmap: use v5.10.1

We use the defined-or (`//', `//=') operators in 5.10,
so require 5.10.1 like the rest of our codebase.  Update
an outdated comment while we're at it.

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/PublicInbox/Msgmap.pm b/lib/PublicInbox/Msgmap.pm
index d28e96c8..d696ce83 100644
--- a/lib/PublicInbox/Msgmap.pm
+++ b/lib/PublicInbox/Msgmap.pm
@@ -6,9 +6,10 @@
 # numbers for NNTP and allows prefix lookups for partial Message-IDs
 # in case URLs get truncated from copy-n-paste errors by users.
 #
-# This is maintained by ::SearchIdx
+# This is maintained by ::SearchIdx (v1) and ::V2Writable (v2)
 package PublicInbox::Msgmap;
 use strict;
+use v5.10.1;
 use DBI;
 use DBD::SQLite;
 use PublicInbox::Over;