Create Dependabot config file

Author: dependabot-preview[bot]

.github/dependabot.yml

@@ -0,0 +1,22 @@
+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/"
+  schedule:
+    interval: weekly
+    day: sunday
+    time: "10:00"
+    timezone: Etc/UCT
+  reviewers:
+  - matz3
+  - RandomByte
+  versioning-strategy: increase
+  ignore:
+  - dependency-name: ava
+    versions:
+    - "< 1.0.2"
+    - ">= 1.0.1.a"
+  - dependency-name: semver
+    versions:
+    - "< 5.5.2"
+    - ">= 5.5.1.a"