Update version to 2.2.8

src/version.h

-#define SRB2VERSION "2.2.7"/* this must be the first line, for cmake !! */
+#define SRB2VERSION "2.2.8"/* this must be the first line, for cmake !! */
 
 // The Modification ID; must be obtained from a Master Server Admin ( https://mb.srb2.org/showgroups.php ).
 // DO NOT try to set this otherwise, or your modification will be unplayable through the Master Server.
@@ -9,7 +9,7 @@
 // it's only for detection of the version the player is using so the MS can alert them of an update.
 // Only set it higher, not lower, obviously.
 // Note that we use this to help keep internal testing in check; this is why v2.2.0 is not version "1".
-#define MODVERSION 48
+#define MODVERSION 49
 
 // Define this as a prerelease version suffix
 // #define BETAVERSION "RC1"