Update README (#190)

tests/python/unittest/test_sparse_operator.py : Passed.

NGRAPH_README.md

@@ -182,7 +182,7 @@ properly if altered to use different nGraph back-ends.
 This is a temporary limitation expected to be lifted in a future release.
 
 ### Test status
-Integration testing to date (3/20/2018) has focused on `tests/cpp/*` and `tests/python/unittest/*`.
+Integration testing to date (3/29/2018) has focused on `tests/cpp/*` and `tests/python/unittest/*`.
 Of these tests, we see the following failures.
 
 #### This test fails with relative errors of <1e-4 on a limit of 1e-5.
@@ -198,11 +198,6 @@ Of these tests, we see the following failures.
 #### Profiler integration is ongoing but incomplete, so profiler fails.
 - `tests/python/unittest/test_profiler.py::test_profiler`
 
-#### The current integration only returns dense arrays, so these tests fail when checking the ouput for sparse tensors.
-- `tests/python/unittest/test_sparse_operator.py::test_elemwise_binary_ops`
-- `tests/python/unittest/test_sparse_operator.py::test_sparse_mathematical_core`
-- `tests/python/unittest/test_sparse_operator.py::test_sparse_unary_with_numerics`
-
 #### We haven't yet integrated nGraph into the debug string, so memory allocation isn't properly supported and test_zero_prop fails
 - `tests/python/unittest/test_symbol.py::test_zero_prop`