Rename Debian package name for saturnin_demo

Underscore does not seem to be allowed in Debian package names.

packaging/debian/control

@@ -20,13 +20,13 @@ Depends:
  shellfu-bash-pretty,
  shellfu-bash-saturnin (>= 0.4.8),
  shellfu-bash-saturnin (<< 5.0),
- shellfu-bash-saturnin_demo,
+ shellfu-bash-saturnin-demo,
 Description: __MKIT_PROJ_NAME__ - __MKIT_PROJ_TAGLINE__
  __SDEMO_MAINDESC__
  .
  __SDEMO_BINDESC__
 
-Package: shellfu-bash-saturnin_demo
+Package: shellfu-bash-saturnin-demo
 Architecture: all
 Depends:
  shellfu (>= 0.10),