Changed artifact name to conform to the other packages.

Makefile.osx

@@ -29,7 +29,7 @@ package: build
 	install -m 644 resources/civetweb_*.png resources/civetweb.icns $(RESOURCES_DIR)/
 	install -m 755 $(CPROG) $(OSXBIN_DIR)/$(PACKAGE)
 	ln -fs /Applications $(DMG_DIR)/
-	hdiutil create $(PACKAGE)_$(CIVETWEB_VERSION).dmg -volname "$(PACKAGE) $(CIVETWEB_VERSION)" -srcfolder $(DMG_DIR) -ov
+	hdiutil create $(PACKAGE)-$(CIVETWEB_VERSION).dmg -volname "$(PACKAGE) $(CIVETWEB_VERSION)" -srcfolder $(DMG_DIR) -ov
 	@rm -rf $(DMG_DIR)
 
 .PHONY: package