Docs: use https where possible

Close gh-2875

README.md

@@ -23,7 +23,7 @@ What you need to build your own jQuery
 
 In order to build jQuery, you need to have the latest Node.js/npm and git 1.7 or later. Earlier versions might work, but are not supported.
 
-For Windows, you have to download and install [git](http://git-scm.com/downloads) and [Node.js](https://nodejs.org/en/download/).
+For Windows, you have to download and install [git](https://git-scm.com/downloads) and [Node.js](https://nodejs.org/en/download/).
 
 OS X users should install [Homebrew](http://brew.sh/). Once Homebrew is installed, run `brew install git` to install git,
 and `brew install node` to install Node.js.

src/css/curCSS.js

@@ -26,7 +26,7 @@ function curCSS( elem, name, computed ) {
 		// Android Browser returns percentage for some values,
 		// but width seems to be reliably pixels.
 		// This is against the CSSOM draft spec:
-		// http://dev.w3.org/csswg/cssom/#resolved-values
+		// https://drafts.csswg.org/cssom/#resolved-values
 		if ( !support.pixelMarginRight() && rnumnonpx.test( ret ) && rmargin.test( name ) ) {
 
 			// Remember the original values

src/event.js

@@ -581,7 +581,7 @@ jQuery.Event = function( src, props ) {
 };
 
 // jQuery.Event is based on DOM3 Events as specified by the ECMAScript Language Binding
-// http://www.w3.org/TR/2003/WD-DOM-Level-3-Events-20030331/ecma-script-binding.html
+// https://www.w3.org/TR/2003/WD-DOM-Level-3-Events-20030331/ecma-script-binding.html
 jQuery.Event.prototype = {
 	constructor: jQuery.Event,
 	isDefaultPrevented: returnFalse,