fix typo in pip install torchx[kfp]

Summary: see title

Reviewed By: tierex

Differential Revision: D29321218

fbshipit-source-id: 413790341275b7fa673f66186206a31fb527cc06

Author: Kiuk Chung

README.md

@@ -25,7 +25,7 @@ TorchX Kubeflow Pipelines Support (torchx-kfp):
 pip install torchx
 
 # install torchx kubeflow pipelines (kfp) support
-pip intall torchx[kfp]
+pip install "torchx[kfp]"
 ```
 
 ## Quickstart