README.md package installation update

Change-Id: Iacc9ba18bc98d42922387ef3e9c59967681227ac
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/README.md b/README.md
index 541ea82..094e757 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,7 @@
     ```
     $ pip install -U requests
     $ pip install -U robotframework-requests
+    $ pip install -U robotframework-httplibrary
     ```
     SSH and SCP base packages:
     For more detailed installation instructions see [robotframework-sshlibrary](https://pypi.python.org/pypi/robotframework-sshlibrary)