Update requirements.txt

Author: spmallick

PyTorch-Multi-Label-Image-Classification:-Image-Tagging/requirements.txt

@@ -5,6 +5,6 @@ scipy==1.4.1
 pillow==7.1.0
 matplotlib==3.2.1
 tqdm==4.44.1
-tensorflow==1.15.0
+tensorflow==1.15.2
 torch==1.4.0
 torchvision==0.5.0