Fixed the broken devkit link (#944)

* Fixed the broken devkit link
* Update imagenet_datamodule.py

---------

Co-authored-by: Jirka Borovec <6035284+Borda@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

pl_bolts/datamodules/imagenet_datamodule.py

@@ -128,18 +128,18 @@ def prepare_data(self) -> None:
  if "meta.bin" not in files:
  raise FileNotFoundError(
  """
-  no meta.bin present. Imagenet is no longer automatically downloaded by PyTorch.
-  To get imagenet:
- 1. download yourself from http://www.image-net.org/challenges/LSVRC/2012/downloads
-  2. download the devkit (ILSVRC2012_devkit_t12.tar.gz)
-  3. generate the meta.bin file using the devkit
-  4. copy the meta.bin file into both train and val split folders
-
-  To generate the meta.bin do the following:
-
-  from pl_bolts.datasets import UnlabeledImagenet
-  path = '/path/to/folder/with/ILSVRC2012_devkit_t12.tar.gz/'
-  UnlabeledImagenet.generate_meta_bins(path)
+ no meta.bin present. Imagenet is no longer automatically downloaded by PyTorch.
+ To get imagenet:
+
+ 1. download the devkit (https://image-net.org/data/ILSVRC/2012/ILSVRC2012_devkit_t12.tar.gz)
+ 2. generate the meta.bin file using the devkit
+ 3. copy the meta.bin file into both train and val split folders
+
+ To generate the meta.bin do the following:
+
+ from pl_bolts.datasets import UnlabeledImagenet
+ path = '/path/to/folder/with/ILSVRC2012_devkit_t12.tar.gz/'
+ UnlabeledImagenet.generate_meta_bins(path)
  """
  )