Replace resource.txt with resource.robot

Change-Id: I4d2afd35645880e33a31644cd717bbeae55666f0
Signed-off-by: Sandhya Somashekar <sansomas@in.ibm.com>
diff --git a/lib/rest_client.robot b/lib/rest_client.robot
index 23aa7b2..7076ef8 100644
--- a/lib/rest_client.robot
+++ b/lib/rest_client.robot
@@ -3,7 +3,7 @@
 Library           String
 Library           RequestsLibrary.RequestsKeywords
 Library           OperatingSystem
-Resource          resource.txt
+Resource          resource.robot
 Library           disable_warning_urllib.py
 Library           utils.py
 Library           gen_misc.py