use triple equals

lib/dialects/sqlite/query-interface.js

@@ -156,7 +156,7 @@ var QueryInterface = module.exports = {
 
                 tableNames.forEach(function(tableName) {
                   // if tableName is not in the Array of tables names then dont drop it
-                  if (skip.indexOf(tableName) == -1) {
+                  if (skip.indexOf(tableName) === -1) {
                     queries.push(self.QueryGenerator.dropTableQuery(tableName).replace(';', ''))
                   }
                 })

lib/query-interface.js

@@ -269,7 +269,7 @@ module.exports = (function() {
             // add the table removal query to the chainer
             tableNames.forEach(function(tableName) {
               // if tableName is not in the Array of tables names then dont drop it
-              if (skip.indexOf(tableName) == -1) {
+              if (skip.indexOf(tableName) === -1) {
                 chainer.add(self, 'dropTable', [ tableName, { cascade: true } ])
               }
             })