update CONTRIBUTORS.md

knockout/tests/jasmine.extensions.d.ts

@@ -1,3 +1,8 @@
+// Type definitions for Knockout specs
+// Project: http://knockoutjs.com
+// Definitions by: Boris Yankov <https://github.com/borisyankov/>, Igor Oleinikov <https://github.com/Igorbek/>, Clément Bourgeois <https://github.com/moonpyk/>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
 // Knockout specs depend on custom Jasmine matchers
 // See https://github.com/knockout/knockout/blob/v3.4.0/spec/lib/jasmine.extensions.js
 // FYI jasmine-jquery.d.ts (https://github.com/velesin/jasmine-jquery) also defines toContainHtml() and toContainText()