[cssom] Update README

Author: Simon Pieters

cssom/README

@@ -38,7 +38,7 @@ near future.
 BUILDING
 
 1. Satisfy all build dependencies (see next section below).
-2. Execute "git clone git://github.com/skynavga/xref.git data".
+2. Execute "git clone https://github.com/whatwg/xref.git data".
 3. Run make (no arguments).
 4. Open the resulting output file Overview.html.
 
@@ -109,7 +109,6 @@ TO DO
 
 2. Content Related
 
-*  Restore named properties (i.e., CSS2Properties) on CSSStyleDeclaration.
 *  Reorganize content sections, reordering aggregating/dividing as needed.
 *  Fill in implicit TBDs.
 *  Address outstanding bugs.