message: Updated spectests README
  AssertReturnCanonicalNan and AssertReturnArithmeticNan are now implemented
diff: @@ -19,8 +19,8 @@ Currently supported command assertions:
  - [x] Module _mostly implemented_ (it should support named modules `(module $Xx)`).
  - [x] AssertReturn _mostly implemented_ (it should support calls to named modules `(invoke $Xx "call")`).
  -- [ ] AssertReturnCanonicalNan _not implemented yet_
  -- [ ] AssertReturnArithmeticNan _not implemented yet_
  +- [x] AssertReturnCanonicalNan _fully implemented_
  +- [x] AssertReturnArithmeticNan _fully implemented_
  - [ ] AssertTrap _not implemented yet_
  - [x] AssertInvalid _Fully implemented_ (it should not require to do validation separate from compilation)
  - [x] AssertMalformed _Fully implemented_
  