Merge pull request #129 from dataquestio/task/bruno/rerun_sols_py38

Rerun solutions for some guided projects with Python 3.8

Mission350Solutions.ipynb

@@ -1976,7 +1976,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.6"
+   "version": "3.8.2"
   }
  },
  "nbformat": 4,

Mission356Solutions.ipynb

@@ -490,7 +490,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.0"
+   "version": "3.8.2"
   }
  },
  "nbformat": 4,