Bump version to 1.5

Changes since 1.4:
 * New commands FB00 (alternative play range command), FFE0 (alternative
   play random sample) and FFE1 (alternative play all samples)
 * New pixel formats -d 1200d and -d 600d,w hich double the size of the
   dots.
 * Assign object IDs dependent on project IDs, to avoid overlap.
 * Fix missing support in tttool play for > and <=

tttool.cabal

@@ -1,5 +1,5 @@
 name:                tttool
-version:             1.4.0.5
+version:             1.5
 synopsis:            Working with files for the Tiptoi® pen
 description:         The Ravensburger Tiptoi® pen is programmed via special
                      files. Their file format has been reverse engineered; this