Use http instead

Signed-off-by: Yong Tang <[email protected]>

Author: yongtang

README.md

@@ -25,8 +25,8 @@ import tensorflow_io as tfio
 
 # Read the MNIST data into the IODataset.
 d_train = tfio.IODataset.from_mnist(
-    'https://yann.lecun.com/exdb/mnist/train-images-idx3-ubyte.gz',
-    'https://yann.lecun.com/exdb/mnist/train-labels-idx1-ubyte.gz')
+    'http://yann.lecun.com/exdb/mnist/train-images-idx3-ubyte.gz',
+    'http://yann.lecun.com/exdb/mnist/train-labels-idx1-ubyte.gz')
 
 # Shuffle the elements of the dataset.
 d_train = d_train.shuffle(buffer_size=1024)