Fix tag

Author: mcbarton

notebooks/xeus-cpp.ipynb

@@ -114,10 +114,7 @@
    "execution_count": 4,
    "id": "945b7054-ed4d-4270-ae9f-c7696392a5d3",
    "metadata": {
-    "slideshow": {
-     "slide_type": ""
-    },
-    "tags": ["--tag-exclude-regex'"],
+    "tags": ["--tag-exclude-regex"],
     "vscode": {
      "languageId": "c++"
     }