Added missing dependency

ansible-pip-requirements.txt

diff --git a/ansible-pip-requirements.txt b/ansible-pip-requirements.txt
index 12f18ec..dcd8995 100644
--- a/ansible-pip-requirements.txt
+++ b/ansible-pip-requirements.txt
@@ -2,3 +2,5 @@
 boto==2.45.0
 markupsafe==0.23
 paramiko==2.0.2
+apache-libcloud
+