Upgrade solidity-coverage to 0.7.1

.solcover.js

@@ -1,12 +1,17 @@
 module.exports = {
- compileCommand: 'npm run build',
- copyPackages: ['openzeppelin-solidity', '@dydxprotocol/exchange-wrappers'],
+
+ // client: require('ganache-cli'), // Use version installed as npm dep
+
  skipFiles: [
  'testing/',
  'external/multisig/MultiSig.sol',
  'external/multisig/DelayedMultiSig.sol',
  'Migrations.sol'
  ],
- testCommand: 'npm run test_cov',
- testrpcOptions: '-d -k=petersburg -p 8555 -i 1002',
+ providerOptions: {
+ port: 8555,
+ network_id: 1002,
+ hardfork: 'petersburg',
+ hdPath: "m/44'/60'/0'/0/"
+ }
 };