Merge pull request #113 from ethstorage/smallchange

update difficulty for integration test

scripts/deployL2-it.js

@@ -54,7 +54,7 @@ async function deployContract() {
   console.log("storage impl address is ", impl);
 
   const data = implContract.interface.encodeFunctionData("initialize", [
-    1572864, // minimumDiff 0.1 * 180 (3 minutes) * 1024 * 1024 / 12 = 1572864 for 0.1 replicas that can have 1M IOs in one epoch
+    10485760, // minimumDiff 0.1 * 1200 (20 minutes) * 1024 * 1024 / 12 = 10485760 for 0.1 replicas that can have 1M IOs in one epoch
     6144000000000000000n, // prepaidAmount - 50% * 2^30 / 131072 * 1500000Gwei, it also means 3145 ETH for half of the shard
     1048576, // nonceLimit 1024 * 1024 = 1M samples and finish sampling in 1.3s with IO rate 6144 MB/s: 4k * 2(random checks) / 6144 = 1.3s
     treasuryAddress, // treasury