Update README

README.md

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 # WingDbg
-Friends don't let friends debug alone
+Friends don't let friends debug alone.
+
+
+## !regfix
+Fixes that nasty bug in WinDbg that makes it not show any
+registers when performing kernel debugging on targets older
+than Windows 8 (approximately). Present since around WinDbg version 6.2.
+
+For more information, see [here][1].
+
+
+  [1]: http://stackoverflow.com/q/35961246/851560