normalized the info about the origin of third-party libraries

lib/single-file/vendor/base64.js

@@ -22,7 +22,7 @@
  * THE SOFTWARE.
 */
 
-// derived from the work of Jameson Little - https://github.com/beatgammit/base64-js
+// derived from https://github.com/beatgammit/base64-js
 
 this.base64 = this.base64 || (() => {
 

lib/single-file/vendor/css-media-query-parser.js

@@ -20,7 +20,7 @@
  * THE SOFTWARE.
 */
 
-// https://github.com/dryoma/postcss-media-query-parser (modified by Gildas Lormeau)
+// derived from https://github.com/dryoma/postcss-media-query-parser
 
 this.mediaQueryParser = (() => {
 

lib/single-file/vendor/css-minifier.js

@@ -1,10 +1,3 @@
-/**
- * UglifyCSS
- * Port of YUI CSS Compressor to Vanilla JS
- * Author: Gildas Lormeau
- * MIT licenced
- */
-
 /**
  * UglifyCSS
  * Port of YUI CSS Compressor to NodeJS
@@ -31,6 +24,8 @@
  * by Yahoo! Inc. under the BSD (revised) open source license.
  */
 
+// derived from https://github.com/fmarcia/UglifyCSS
+
 this.cssMinifier = this.cssMinifier || (() => {
 
 	/**

lib/single-file/vendor/css-tree.js

@@ -20,6 +20,8 @@
  * THE SOFTWARE.
  */
 
+// derived from https://github.com/csstree/csstree
+
 this.cssTree = this.cssTree || (() => {
 
 	function createItem(data) {

lib/single-file/vendor/html-srcset-parser.js

@@ -14,6 +14,8 @@
  * (except for comments in parens).
  */
 
+// derived from https://github.com/albell/parse-srcset
+
 this.srcsetParser = this.srcsetParser || (() => {
 
 	return {