Add Sapling to upgrade list

src/consensus/params.h

@@ -23,6 +23,7 @@ enum UpgradeIndex {
     BASE_SPROUT,
     UPGRADE_TESTDUMMY,
     UPGRADE_OVERWINTER,
+    UPGRADE_SAPLING,
     // NOTE: Also add new upgrades to NetworkUpgradeInfo in upgrades.cpp
     MAX_NETWORK_UPGRADES
 };