Fix typo in About this notebook sections

Author: jsdodge

notebooks/0.0-Introduction-to-Python.ipynb

@@ -1084,7 +1084,7 @@
    "metadata": {},
    "source": [
     "##### About this notebook\n",
-    "© J. Steven Dodge, 2019.The notebook text is licensed under CC BY 4.0. See more at [Creative Commons](https://creativecommons.org/licenses/by/4.0/). The notebook code is open source under the [MIT License](https://opensource.org/licenses/MIT)."
+    "© J. Steven Dodge, 2019. The notebook text is licensed under CC BY 4.0. See more at [Creative Commons](https://creativecommons.org/licenses/by/4.0/). The notebook code is open source under the [MIT License](https://opensource.org/licenses/MIT)."
    ]
   }
  ],

notebooks/1.0-Random-numbers.ipynb

@@ -42,7 +42,7 @@
    "metadata": {},
    "source": [
     "##### About this notebook\n",
-    "© J. Steven Dodge, 2019.The notebook text is licensed under CC BY 4.0. See more at [Creative Commons](https://creativecommons.org/licenses/by/4.0/). The notebook code is open source under the [MIT License](https://opensource.org/licenses/MIT)."
+    "© J. Steven Dodge, 2019. The notebook text is licensed under CC BY 4.0. See more at [Creative Commons](https://creativecommons.org/licenses/by/4.0/). The notebook code is open source under the [MIT License](https://opensource.org/licenses/MIT)."
    ]
   }
  ],

notebooks/2.0-Basic-statistics.ipynb

@@ -653,7 +653,7 @@
    "metadata": {},
    "source": [
     "##### About this notebook\n",
-    "© J. Steven Dodge, 2019.The notebook text is licensed under CC BY 4.0. See more at [Creative Commons](https://creativecommons.org/licenses/by/4.0/). The notebook code is open source under the [MIT License](https://opensource.org/licenses/MIT)."
+    "© J. Steven Dodge, 2019. The notebook text is licensed under CC BY 4.0. See more at [Creative Commons](https://creativecommons.org/licenses/by/4.0/). The notebook code is open source under the [MIT License](https://opensource.org/licenses/MIT)."
    ]
   }
  ],

notebooks/2.1-Evaluating-the-Gaussian-integral.ipynb

@@ -416,7 +416,7 @@
    "metadata": {},
    "source": [
     "##### About this notebook\n",
-    "© J. Steven Dodge, 2019.The notebook text is licensed under CC BY 4.0. See more at [Creative Commons](https://creativecommons.org/licenses/by/4.0/). The notebook code is open source under the [MIT License](https://opensource.org/licenses/MIT)."
+    "© J. Steven Dodge, 2019. The notebook text is licensed under CC BY 4.0. See more at [Creative Commons](https://creativecommons.org/licenses/by/4.0/). The notebook code is open source under the [MIT License](https://opensource.org/licenses/MIT)."
    ]
   }
  ],

notebooks/3.0-Basic-probability.ipynb

@@ -1216,7 +1216,7 @@
    "metadata": {},
    "source": [
     "##### About this notebook\n",
-    "© J. Steven Dodge, 2019.The notebook text is licensed under CC BY 4.0. See more at [Creative Commons](https://creativecommons.org/licenses/by/4.0/). The notebook code is open source under the [MIT License](https://opensource.org/licenses/MIT)."
+    "© J. Steven Dodge, 2019. The notebook text is licensed under CC BY 4.0. See more at [Creative Commons](https://creativecommons.org/licenses/by/4.0/). The notebook code is open source under the [MIT License](https://opensource.org/licenses/MIT)."
    ]
   }
  ],

notebooks/4.0-Error-propagation.ipynb

@@ -769,7 +769,7 @@
    "metadata": {},
    "source": [
     "##### About this notebook\n",
-    "© J. Steven Dodge, 2019.The notebook text is licensed under CC BY 4.0. See more at [Creative Commons](https://creativecommons.org/licenses/by/4.0/). The notebook code is open source under the [MIT License](https://opensource.org/licenses/MIT)."
+    "© J. Steven Dodge, 2019. The notebook text is licensed under CC BY 4.0. See more at [Creative Commons](https://creativecommons.org/licenses/by/4.0/). The notebook code is open source under the [MIT License](https://opensource.org/licenses/MIT)."
    ]
   }
  ],