Update dependencies in README

Author: SylvainCorlay

README.md

@@ -30,7 +30,8 @@ conda install -c conda-forge xtensor-python
 
 | `xtensor-python`  | `xtensor`  |  `pybind11` |
 |-------------------|------------|-------------|
-| master            |   0.8.0    | ^2.1.0      |
+| master            |   0.8.1    | ^2.1.0      |
+| 0.8.0             |   0.8.1    | ^2.1.0      |
 | 0.7.1             |   0.7.3    | ^2.0.0      |
 | 0.7.0             |   0.7.2    | ^2.0.0      |
 | 0.6.1             |   0.7.1    | ^2.0.0      |