feat: add also language chain (#1324)

* Add `also` language chain

This would be helpful, as the property doesn't clash with other methods.

* Add `also` to tests

Author: sportshead

lib/chai/core/assertions.js

@@ -34,6 +34,7 @@ module.exports = function (chai, _) {
    * - but
    * - does
    * - still
+   * - also
    *
    * @name language chains
    * @namespace BDD
@@ -43,7 +44,7 @@ module.exports = function (chai, _) {
   [ 'to', 'be', 'been', 'is'
   , 'and', 'has', 'have', 'with'
   , 'that', 'which', 'at', 'of'
-  , 'same', 'but', 'does', 'still' ].forEach(function (chain) {
+  , 'same', 'but', 'does', 'still', "also" ].forEach(function (chain) {
     Assertion.addProperty(chain);
   });
 

test/expect.js

@@ -233,7 +233,7 @@ describe('expect', function () {
     [ 'to', 'be', 'been', 'is'
     , 'and', 'has', 'have', 'with'
     , 'that', 'which', 'at', 'of'
-    , 'same', 'but', 'does', 'still' ].forEach(test);
+    , 'same', 'but', 'does', 'still', 'also' ].forEach(test);
   });
 
   describe("fail", function() {