Added note about MustMatchers being resurrected in 2.1.0 to the 2.0 release notes.
Added note about MustMatchers being resurrected in 2.1.0 to the 2.0 release notes.

jedesah/scalatest-website,scalatest/scalatest-website,scalatest/scalatest-website,cheeseng/scalatest-website