Fix bug in APRS-IS server login.

The `vers` field in the APRS-IS server login is optional, but if you
choose to use it (`aprs-weather-submit` does), then you need to send
the app name and version, separated by a space. I was using a slash.
My bad.  This commit fixes it.

That being said, I've never had a problem with this app before, so
I'm going to guess that this is a mostly cosmetic change.

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Next version
 - Fixed a bug where v1.8.1 would not handle timeouts correctly using the Win32 API.  The changes are queued for the next version, though I've already included them in the released binaries.
+- Fixed a bug in APRS server negotiation.  The `vers` field expects the app name and version, separated by a space;  however, I was separating it with a forward slash instead.
 
 ## Version 1.8.1
 <time datetime="2024-11-03">November 3, 2024</time>

src/aprs-is.c

@@ -217,7 +217,7 @@ sendPacket (const char* const restrict server,
 	}
 
 	/* Authenticate */
-	sprintf(buffer, "user %s pass %s vers %s/%s\n",
+	sprintf(buffer, "user %s pass %s vers %s %s\n",
 	        username, password, PACKAGE, VERSION);
 #ifdef DEBUG
 	printf("> %s", buffer);