release v1.2.3 (#234)

* release v1.2.3

* change dep of liftsim a2c

examples/LiftSim_baseline/A2C/README.md

@@ -7,7 +7,7 @@
 ## 依赖库
 
 + [paddlepaddle>=1.6.1](https://github.com/PaddlePaddle/Paddle)
-+ [parl>=1.2.2](https://github.com/PaddlePaddle/PARL)
++ [parl>=1.2.3](https://github.com/PaddlePaddle/PARL)
 + [rlschool>=0.1.1][rlschool]
 
 

parl/__init__.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "1.2.2"
+__version__ = "1.2.3"
 """
 generates new PARL python API
 """