- correct link in open badge (to main instead of feature branch)

Author: MarcelRosier

AURORA/tutorial.ipynb

@@ -13,7 +13,7 @@
     "### Setup Colab environment\n",
     "If you installed the packages and requirments on your own machine, you can skip this section and start from the import section. Otherwise you can follow and execute the tutorial on your browser. In order to start working on the notebook, click on the following button, this will open this page in the Colab environment and you will be able to execute the code on your own.\n",
     "\n",
-    "<a target=\"_blank\" href=\"https://colab.research.google.com/github/BrainLesion/tutorials/blob/19-feature-request-add-open-in-collab-badge/AURORA/tutorial.ipynb\">\n",
+    "<a target=\"_blank\" href=\"https://colab.research.google.com/github/BrainLesion/tutorials/blob/main/AURORA/tutorial.ipynb\">\n",
     "  <img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/>\n",
     "</a>\n",
     "\n",