Upgrade to GitHub-native Dependabot (#74)

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

.github/dependabot.yml

@@ -0,0 +1,43 @@
+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "10:00"
+  open-pull-requests-limit: 10
+  ignore:
+  - dependency-name: "@microsoft/api-extractor"
+    versions:
+    - 7.13.3
+    - 7.13.4
+    - 7.13.5
+  - dependency-name: rollup
+    versions:
+    - 2.38.5
+    - 2.39.1
+    - 2.41.0
+    - 2.41.4
+    - 2.42.0
+    - 2.42.2
+    - 2.42.3
+  - dependency-name: "@microsoft/api-documenter"
+    versions:
+    - 7.12.11
+    - 7.12.8
+    - 7.12.9
+  - dependency-name: rollup-plugin-typescript2
+    versions:
+    - 0.30.0
+  - dependency-name: "@types/mocha"
+    versions:
+    - 8.2.1
+  - dependency-name: bignumber.js
+    versions:
+    - 9.0.1
+  - dependency-name: chai
+    versions:
+    - 4.3.0
+  - dependency-name: crypto-js
+    versions:
+    - 4.0.0