Return null to tell Bluebird non-return is intentional

lib/dialects/abstract/connection-manager.js

@@ -97,6 +97,7 @@ ConnectionManager.prototype.initPools = function () {
       },
       destroy: function(connection) {
         self.$disconnect(connection);
+        return null;
       },
       max: config.pool.max,
       min: config.pool.min,
@@ -174,6 +175,7 @@ ConnectionManager.prototype.initPools = function () {
       },
       destroy: function(connection) {
         self.$disconnect(connection);
+        return null;
       },
       validate: config.pool.validate,
       max: config.pool.max,
@@ -191,6 +193,7 @@ ConnectionManager.prototype.initPools = function () {
       },
       destroy: function(connection) {
         self.$disconnect(connection);
+        return null;
       },
       validate: config.pool.validate,
       max: config.pool.max,
@@ -221,6 +224,7 @@ ConnectionManager.prototype.getConnection = function(options) {
           self.versionPromise = null;
 
           self.$disconnect(connection);
+          return null;
         });
       }).catch(function (err) {
         self.versionPromise = null;