update readme for Vraibles can be placed on gpu

README.md

@@ -15,12 +15,12 @@ Please see the main repository for full Tensorflow documentation.  This readme w
 ### What's working
 - per-element binary operators: `add`, `sub`, `mul`, `div`, `pow`, `minimum`, `maximum`, `squared_difference`, as per [test_tf3.py](tensorflow/stream_executor/cl/test/test_tf3.py)
 - per-element unary operators: `tanh`, `abs`, `acos`, `asin`, `atan`, `ceil`, `cos`, `exp`, `floor`, `inverse`, `isfinite`, `isinf`, `isnan`, `log`, `neg`, `sign`, `sin`, `sqrt`, square`, `tan` (test: [test_tf4.py](tensorflow/stream_executor/cl/test/test_tf4.py))
+- Variables can be placed on GPU
 
 ### To do
 
 - blas
 - convolutions
-- Variables
 - reductions
 - gradients
 
@@ -90,6 +90,7 @@ python ~/git/tensorflow-cl/tensorflow/stream_executor/cl/test/test_blas.py
     - the bad news is that everything else is not :-P
   - (re-)added following per-element binary operators: `sub`, `mul`, `div`, `pow`, `minimum`, `maximum`, `squared_difference`.  This time, they actually are really running on the gpu :-)  (test: [test_tf3.py](tensorflow/stream_executor/cl/test/test_tf3.py))
   - (re-)added following per-element unary operators:, which really are running on gpu now :-), [test_tf4.py](tensorflow/stream_executor/cl/test/test_tf4.py): `tanh`, `abs`, `acos`, `asin`, `atan`, `ceil`, `cos`, `exp`, `floor`, `inverse`, `isfinite`, `isinf`, `isnan`, `log`, `neg`, `sign`, `sin`, `sqrt`, square`, `tan`
+  - Variables can be placed on gpu now, [test_gradients.py](tensorflow/stream_executor/cl/test/test_gradients.py)
 - Oct 23:
   - can use component wise addition from Python now :-)
   - fixed critical bug involving `float4`s, that meant that tensors larger than, say, 3 :-P, could not be added correctly