switch to pallet_revive runtime (#40)

Signed-off-by: xermicus <cyrill@parity.io>

crates/integration/contracts/Fibonacci.sol

@@ -2,7 +2,29 @@
 
 pragma solidity ^0.8;
 
-// https://medium.com/coinmonks/fibonacci-in-solidity-8477d907e22a
+/* runner.json
+{
+    "actions": [
+    {
+      "Instantiate": {}
+    },
+    {
+      "Call": {
+        "dest": {
+            "Instantiated": 0
+        },
+        "data": "6b83dd2e0000000000000000000000000000000000000000000000000000000000000006"
+      }
+    },
+    {
+        "VerifyCall": {
+            "success": true,
+            "output": "0000000000000000000000000000000000000000000000000000000000000008"
+        }
+    }
+  ]
+}
+*/
 
 contract FibonacciRecursive {
     function f(uint n) internal pure returns (uint) {
@@ -36,6 +58,7 @@ contract FibonacciIterative {
     }
 }
 
+// https://medium.com/coinmonks/fibonacci-in-solidity-8477d907e22a
 contract FibonacciBinet {
     function fib3(uint n) external pure returns (uint a) {
         if (n == 0) {