chore: clean up linting issues introduced during migration

Author: mbroadst

test/functional/change_stream_spec.test.js

@@ -199,10 +199,7 @@ describe('Change Stream Spec', function() {
       });
     }
 
-    return changeStreamPromise.then(
-      result => close(null, result),
-      err => close(err)
-    );
+    return changeStreamPromise.then(result => close(null, result), err => close(err));
   }
 
   function runOperations(client, operations) {

test/unit/core/connection_string.test.js

@@ -1,7 +1,6 @@
 'use strict';
 
 const parseConnectionString = require('../../../lib/core/uri_parser');
-const fs = require('fs');
 const punycode = require('punycode');
 const MongoParseError = require('../../../lib/core/error').MongoParseError;
 const loadSpecTests = require('../../spec').loadSpecTests;