Update dependencies in README

Change-Id: I2ab31de290ed162d3de1073636f8003cb8918172
diff --git a/trellis/README.md b/trellis/README.md
index b9f3901..dcfed3e 100644
--- a/trellis/README.md
+++ b/trellis/README.md
@@ -14,8 +14,7 @@
 Some dependencies need to be installed for a fresh Ubuntu.
 ```
 sudo apt-get update
-sudo apt-get install texinfo
-sudo apt-get install python-pip
+sudo apt-get install gawk texinfo python-pip
 sudo pip install ipaddress
 ```