add --dummy-variables-rgx= param when calling pylint

new pylint in trusty complains about '_' variables if we don't do this.
This seems to be ok in older versions of pylint also.

1 files changed, 1 insertions, 0 deletions

diff --git a/tools/run-pylint b/tools/run-pylint
index 0b7c16d4..0fe0c64a 100755
--- a/tools/run-pylint
+++ b/tools/run-pylint
@@ -16,6 +16,7 @@ cmd=(
     --rcfile=$RC_FILE
     --disable=R
     --disable=I
+    --dummy-variables-rgx="_"
     "${files[@]}"
 )