Stop using jQuery.isFunction since it's deprecated

As of jQuery 3.3, jQuery.isFunction() has been deprecated. In most
cases, its use can be replaced by typeof x === "function".

See https://api.jquery.com/jquery.isfunction/

Author: ablanco

CHANGES.md

@@ -1,5 +1,10 @@
 # CHANGELOG
 
+## 3.0.10dev
+
+- Update dev dependencies.
+- Stop using deprecated $.isFunction.
+
 ## 3.0.9
 
 - Add jsdelivr entry in package.json.

src/methods.js

@@ -51,7 +51,7 @@ var methods = {};
             } else {
                 score = rulesEngine.executeRules(options, word);
             }
-            if ($.isFunction(options.common.onScore)) {
+            if (typeof options.common.onScore === 'function') {
                 score = options.common.onScore(options, word, score);
             }
         }
@@ -64,7 +64,7 @@ var methods = {};
             console.log(score + ' - ' + verdictText);
         }
 
-        if ($.isFunction(options.common.onKeyUp)) {
+        if (typeof options.common.onKeyUp === 'function') {
             options.common.onKeyUp(event, {
                 score: score,
                 verdictText: verdictText,
@@ -115,7 +115,7 @@ var methods = {};
             ui.initUI(localOptions, $el);
             $el.trigger('keyup');
 
-            if ($.isFunction(localOptions.common.onLoad)) {
+            if (typeof localOptions.common.onLoad === 'function') {
                 localOptions.common.onLoad();
             }
         });
@@ -180,10 +180,10 @@ var methods = {};
                 ruleFunction = rulesEngine.validation[rule],
                 result;
 
-            if (!$.isFunction(ruleFunction)) {
+            if (typeof ruleFunction !== 'function') {
                 ruleFunction = options.rules.extra[rule];
             }
-            if ($.isFunction(ruleFunction)) {
+            if (typeof ruleFunction === 'function') {
                 result = ruleFunction(options, $(el).val(), 1);
                 if ($.isNumeric(result)) {
                     rulesMetCnt += result;

src/rules.js

@@ -228,11 +228,11 @@ try {
                 score = options.rules.scores[rule];
                 funct = rulesEngine.validation[rule];
 
-                if (!$.isFunction(funct)) {
+                if (typeof funct !== 'function') {
                     funct = options.rules.extra[rule];
                 }
 
-                if ($.isFunction(funct)) {
+                if (typeof funct === 'function') {
                     result = funct(options, word, score);
                     if (result) {
                         totalScore += result;