Add dependabot (#312)

* add dependabot

* Update config.yml

Author: Eclairemoy

.circleci/config.yml

@@ -1,12 +1,15 @@
-version: 2
+version: 2.1
+
 jobs:
   build:
     docker:
-      - image: circleci/openjdk:8-jdk-stretch-node-browsers
+      - image: cimg/openjdk:8.0
 
     working_directory: ~/intercom-java
 
     steps:
       - checkout
+
+      - run: chmod +x ./gradlew
       - run: TERM="dumb" ./gradlew dependencies
       - run: TERM="dumb" ./gradlew test

.github/dependabot.yml

@@ -0,0 +1,14 @@
+version: 2
+updates:
+  - package-ecosystem: "gradle"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+    commit-message:
+      prefix: "chore"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"