Merge pull request deepchem#2221 from vincentweisser/patch-1

Wrong link corrected

examples/tutorials/03_An_Introduction_To_MoleculeNet.ipynb

@@ -18,7 +18,7 @@
     "\n",
     "This tutorial and the rest in this sequence can be done in Google colab. If you'd like to open this notebook in colab, you can use the following link.\n",
     "\n",
-    "[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/deepchem/deepchem/blob/master/examples/tutorials/02_Working_With_Datasets.ipynb)\n",
+    "[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/deepchem/deepchem/blob/master/examples/tutorials/03_An_Introduction_To_MoleculeNet.ipynb)\n",
     "\n",
     "\n",
     "## Setup\n",