VERSION 0.6.8: changes in preparation for binary release

This version contains no significant changes to the engine itself, just to
the installer, the GUI, and packaging and such. It's all stuff for prep for
the big release, which is fast approaching!

version.h

@@ -41,6 +41,6 @@
 /**
  * Revision
  */
-#define ZEROTIER_ONE_VERSION_REVISION 7
+#define ZEROTIER_ONE_VERSION_REVISION 8
 
 #endif