Update README.md keras_dump

hpvm/projects/keras/README.md

@@ -47,7 +47,7 @@ Activate conda environment (above) before running benchmarks
 ### Synopsys
 
 ```
-python src/${BENCH_NAME}.py  [hpvm_reload|keras_reload]  [frontend] 
+python src/${BENCH_NAME}.py  [hpvm_reload|keras_reload]  [frontend|keras_dump] 
 
 ```
 
@@ -59,6 +59,8 @@ python src/${BENCH_NAME}.py  [hpvm_reload|keras_reload]  [frontend]
 
 `frontend`: Invokes the HPVM frontend and dumps weights in directory specified in constructor
 
+`keras_dump`: Dumps keras .h5 format model weights in directory specified in constructor
+
 
 
 ### Building New Benchmarks