fix linting issues

remix-lib/src/execution/execution-context.js

@@ -276,14 +276,14 @@ function ExecutionContext () {
   }
 
   this.addBlock = function (block) {
-    let blockNumber = "0x" + block.header.number.toString('hex')
+    let blockNumber = '0x' + block.header.number.toString('hex')
     blockNumber = web3.toHex(web3.toBigNumber(blockNumber))
 
-    self.blocks["0x" + block.hash().toString('hex')] = block
+    self.blocks['0x' + block.hash().toString('hex')] = block
     self.blocks[blockNumber] = block
   }
 
-  this.trackTx = function(tx, block) {
+  this.trackTx = function (tx, block) {
     self.txs[tx] = block
   }
 }

remix-lib/src/execution/txRunner.js

@@ -13,7 +13,7 @@ class TxRunner {
     this.blockNumber = 0
     this.runAsync = true
     if (executionContext.isVM()) {
-      //this.blockNumber = 1150000 // The VM is running in Homestead mode, which started at this block.
+      // this.blockNumber = 1150000 // The VM is running in Homestead mode, which started at this block.
       this.blockNumber = 2 // The VM is running in Homestead mode, which started at this block.
       this.runAsync = false // We have to run like this cause the VM Event Manager does not support running multiple txs at the same time.
     }
@@ -94,7 +94,7 @@ class TxRunner {
     }
   }
 
-  runInVm(from, to, data, value, gasLimit, useCall, timestamp, callback) {
+  runInVm (from, to, data, value, gasLimit, useCall, timestamp, callback) {
     const self = this
     var account = self.vmaccounts[from]
     if (!account) {
@@ -119,8 +119,7 @@ class TxRunner {
         number: self.blockNumber,
         coinbase: coinbases[self.blockNumber % coinbases.length],
         difficulty: difficulties[self.blockNumber % difficulties.length],
-        coinbase: coinbases[0],
-        gasLimit: new BN("5000000").imuln(1)
+        gasLimit: new BN('5000000').imuln(1)
       },
       transactions: [tx],
       uncleHeaders: []
@@ -144,7 +143,7 @@ class TxRunner {
         }
 
         executionContext.addBlock(block)
-        executionContext.trackTx("0x" + tx.hash().toString('hex'), block)
+        executionContext.trackTx('0x' + tx.hash().toString('hex'), block)
 
         callback(err, {
           result: result,