Bump version file

Author: Sebazzz

Marlin/Version.h

@@ -41,7 +41,7 @@
  * here we define this default string as the date where the latest release
  * version was tagged.
  */
-//#define STRING_DISTRIBUTION_DATE "2020-07-09"
+#define STRING_DISTRIBUTION_DATE "2020-12-30"
 
 /**
  * Defines a generic printer name to be output to the LCD after booting Marlin.