chore(build): activate dependabot (#619)

* github, activate dependabot
* travis, ignore dependabot branches

.github/dependabot.yml

@@ -0,0 +1,24 @@
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+      day: monday
+    open-pull-requests-limit: 5
+    target-branch: "ci"
+    versioning-strategy: increase
+    allow:
+      - dependency-type: direct
+    labels:
+      - "build"
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: monthly
+      day: monday
+    open-pull-requests-limit: 2
+    target-branch: "ci"
+    labels:
+      - "build"

.travis.yml

@@ -12,6 +12,7 @@ cache: yarn
 jobs:
   include:
     - stage: Test
+      if: NOT branch =~ /^(dependabot\/)/
       before_script: yarn global add codecov
       script: yarn test
       after_success: codecov