Update config.yml

Author: LiamConnors

.circleci/config.yml

@@ -39,7 +39,7 @@ jobs:
             bundle install --path vendor/bundle
             sudo rm /etc/apt/sources.list
             echo "deb [trusted=yes] http://archive.debian.org/debian/ jessie main contrib non-free" | sudo tee -a /etc/apt/sources.list
-            echo "deb-src http://archive.debian.org/debian jessie main contrib non-free" | sudo tee -a /etc/apt/sources.list
+            echo "deb-src [trusted=yes] http://archive.debian.org/debian jessie main contrib non-free" | sudo tee -a /etc/apt/sources.list
             echo "Acquire::Check-Valid-Until false;" | sudo tee -a /etc/apt/apt.conf.d/10-nocheckvalid
             echo '# Package: *\nPin: origin "archive.debian.org"\nPin-Priority: 500' | sudo tee -a /etc/apt/preferences.d/10-archive-pin
             sudo apt-get update