Fix pip install package command

Fix the wrong package name.

Change-Id: If35590bac30cf614a596fdd955853eb8a2e69db9
diff --git a/README.md b/README.md
index 1e4d8ff..522d482 100755
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@
 ```
 sudo apt-get install python python-pip python-dev python-lxml -y
 sudo pip install ncclient
-sudo pip install scapy pycripto
+sudo pip install scapy pycrypto
 sudo apt-get install python-ecdsa git
 ```