Add check for jQuery slim version

jQuery has released with jQuery 3.1.1 a 'slim' version that excludes easing. jQuery Easing Plugin tries to preserve the original jQuery 'swing' easing by default. A check was added to prevent error messages.
gdsmith · Oct 3, 2017 · afff17b · afff17b
1 parent fdf871b
commit afff17b
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diff --git a/jquery.easing.js b/jquery.easing.js
@@ -19,7 +19,9 @@
 })(function($){
 
 // Preserve the original jQuery "swing" easing as "jswing"
-$.easing['jswing'] = $.easing['swing'];
+if (typeof $.easing !== 'undefined') {
+	$.easing['jswing'] = $.easing['swing'];
+}
 
 var pow = Math.pow,
 	sqrt = Math.sqrt,

diff --git a/jquery.easing.min.js b/jquery.easing.min.js