Update README.md

Merge pull request seleniumQuery#12 from seleniumQuery/xpath_go2

Xpath go2

Removed unused constructor

Added strikethrough to denote unsupported selectors

Changed tests for bizarre jQuery escaping

Added remaining (untested) compiled pseudos

:first-child
:lang()
:not() -- should test specially :not(contains) and
:not([attribute='stuff']) with and without quotes on both
:only-child
:only-of-type
:present
:root

Full .is() rework with add of CSS Parser, now faster than ever part 2

Please check the previous commit also, it was broken in two by mistake

Updated Apache v2 License

Updated to current snapshot version

Updated current version reference