Add 'reclass' to the requirements

To work with reclass-tools from Python virtual env it need
the 'reclass' package installed.

Change-Id: Ife650b359602429bcff5b314d410a1c24b05ca79
diff --git a/requirements.txt b/requirements.txt
index 1f5c522..2c964b2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,5 @@
 six>=1.9.0
 cookiecutter
 jinja2==2.8.1
-mock>=1.2
\ No newline at end of file
+mock>=1.2
+reclass