Update README.md

removing rebase aspect of workflow, as it interferes with updating a pull request.
Update README.md
Update README.md
Update README.md

add link to Github issue tracker
test instance and schema for attribute text (base from xsd:token)
Merge branch '1.01' into 1.02

* 1.01:
  test instance and schema for attribute text (base from xsd:token)
changing 1.01 to 1.02 in relaxng redirects