Modified README to reflect the change in license (which was ages ago, in fact)
Modified README to reflect the change in license (which was ages ago, in fact)

hjwylde/whiley-compiler,hjwylde/whiley-compiler,hjwylde/whiley-compiler,hjwylde/whiley-compiler,hjwylde/whiley-compiler,Whiley/WhileyCompiler