Update colab link

Author: ovalle15

examples/annotation_import/image.ipynb

@@ -20,7 +20,7 @@
       },
       "source": [
         "<td>\n",
-        "<a href=\"https://github.com/Labelbox/labelbox-python/tree/develop/examples/annotation_import/image.ipynb\" target=\"_blank\"><img\n",
+        "<a href=\"https://colab.research.google.com/github/Labelbox/labelbox-python/blob/develop/examples/annotation_import/image.ipynb\" target=\"_blank\"><img\n",
         "src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"></a>\n",
         "</td>\n",
         "\n",