Add ninja to PyTorch README.md file. (#20079)

Guanheng Zhang · facebook-github-bot · commit 0e77c0f5de4d · 2019-05-03T07:13:51.000-07:00
Summary: Fixes #17572 Pull Request resolved: #20079 Differential Revision: D15195388 Pulled By: zhangguanheng66 fbshipit-source-id: b7448b482f07e96753f727664416a5d0e85602b4
diff --git a/README.md b/README.md
@@ -169,7 +169,7 @@ If you are building for NVIDIA's Jetson platforms (Jetson Nano, TX1, TX2, AGX Xa
 
 Common
 ```
-conda install numpy pyyaml mkl mkl-include setuptools cmake cffi typing
+conda install numpy ninja pyyaml mkl mkl-include setuptools cmake cffi typing
 ```
 
 On Linux
