Update config.yml

Author: gkorland

.circleci/config.yml

@@ -7,6 +7,9 @@ jobs:
 
     steps:
       - checkout
+      - run:
+          name: Install Submodules
+          command: git submodule sync && git submodule update --init
       - run:
           name: Version information
           command: rustc --version; cargo --version; rustup --version