[skip ci] Updated nightly to latest stable pytorch-xla in teaser notebook (pytorch#1990)

* [skip ci] Updated nightly to stable pytorch-xla in teaser notebook

* [skip ci] Updated nightly to stable pytorch-xla in teaser notebook

* [skip ci] Updated nightly to latest stable pytorch-xla in teaser notebook

Author: Priyansi

assets/tldr/teaser.ipynb

@@ -48,9 +48,8 @@
     "with_torch_launch = \"WORLD_SIZE\" in os.environ\n",
     "\n",
     "if in_colab:\n",
-    "    VERSION = \"nightly\"\n",
-    "    !curl https://raw.githubusercontent.com/pytorch/xla/master/contrib/scripts/env-setup.py -o pytorch-xla-env-setup.py\n",
-    "    !python pytorch-xla-env-setup.py --version $VERSION"
+    "    VERSION = !curl -s https://api.github.com/repos/pytorch/xla/releases/latest | grep -Po '\"tag_name\": \"v\\K.*?(?=\")'\n",
+    "    !pip install cloud-tpu-client==0.10 https://storage.googleapis.com/tpu-pytorch/wheels/torch_xla-{VERSION[0]}-cp37-cp37m-linux_x86_64.whl"
    ]
   },
   {
@@ -485,4 +484,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 4
-}
+}