caching on circleci builds

Author: HeyAlex

.circleci/config.yml

@@ -9,7 +9,7 @@ jobs:
     steps:
       - checkout
       - restore_cache:
-          key: jars-{{ checksum "build.gradle" }}-{{ checksum  "app/build.gradle" }}
+          key: jars-{{ checksum "build.gradle" }}--{{ checksum  "widget-helper/build.gradle" }}--{{ checksum  "example/build.gradle" }}
       - run:
           name: Chmod permissions #if permission for Gradlew Dependencies fail, use this.
           command: sudo chmod +x ./gradlew
@@ -23,7 +23,7 @@ jobs:
       - save_cache:
           paths:
             - ~/.gradle
-          key: jars-{{ checksum "build.gradle" }}-{{ checksum  "app/build.gradle" }}
+          key: jars-{{ checksum "build.gradle" }}--{{ checksum  "widget-helper/build.gradle" }}--{{ checksum  "example/build.gradle" }}
       - run:
           name: Run Tests
           command: ./gradlew :widget-helper:lint test