Add stagenet fork heights

src/cryptonote_core/blockchain.cpp

@@ -116,16 +116,8 @@ static const struct {
   uint8_t threshold;
   time_t time;
 } stagenet_hard_forks[] = {
-  // version 1 from the start of the blockchain
-  { 1, 1, 0, 1341378000 },
-
-  // versions 2-7 in rapid succession from March 13th, 2018
-  { 2, 32000, 0, 1521000000 },
-  { 3, 33000, 0, 1521120000 },
-  { 4, 34000, 0, 1521240000 },
-  { 5, 35000, 0, 1521360000 },
-  { 6, 36000, 0, 1521480000 },
-  { 7, 37000, 0, 1521600000 },
+ { 7, 1, 0, 1519605000 },
+ { 8, 10, 0, 1530621606 },
 };
 
 //------------------------------------------------------------------