Update Dependabot config file (#1244)

Summary:
👋 Dependabot is moving natively into GitHub! This pull request updates your config file to the [new syntax](https://help.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates). When you merge this pull request, we'll swap out `dependabot-preview` (me) for a new `dependabot` app, and you'll be all set!

With this change, you'll now use the [Dependabot page in GitHub](https://github.com/facebook/flipper/network/updates), rather than the [Dependabot dashboard](https://app.dependabot.com/), to monitor your version updates. Dependabot is now configured exclusively using config files.

If you've got any questions or feedback for us, please let us know by creating an issue in the [dependabot/feedback](https://github.com/dependabot/feedback) repository.

[Learn more about the relaunch of Dependabot](https://github.blog/2020-06-01-keep-all-your-packages-up-to-date-with-dependabot/)

Please note that regular `dependabot` commands do not work on this pull request.

:robot:💛
Pull Request resolved: https://github.com/facebook/flipper/pull/1244

Reviewed By: nikoant

Differential Revision: D21998719

Pulled By: passy

fbshipit-source-id: 4e76f8a932d5c95e23a0445e8ed74f7b8fa28919

.dependabot/config.yml

@@ -1,8 +0,0 @@
-version: 1
-update_configs:
-  - package_manager: "javascript"
-    directory: "/desktop"
-    update_schedule: "weekly"
-  - package_manager: "rust:cargo"
-    directory: "/packer"
-    update_schedule: "weekly"

.github/dependabot.yml

@@ -0,0 +1,82 @@
+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/desktop"
+  schedule:
+    interval: weekly
+    time: '13:00'
+  open-pull-requests-limit: 10
+  ignore:
+  - dependency-name: async-mutex
+    versions:
+    - ">= 0.2.a, < 0.3"
+  - dependency-name: babel-eslint
+    versions:
+    - ">= 10.1.a, < 10.2"
+  - dependency-name: "@babel/plugin-proposal-nullish-coalescing-operator"
+    versions:
+    - "> 7.8.3, < 8"
+  - dependency-name: "@babel/plugin-transform-typescript"
+    versions:
+    - "> 7.9.0, < 8"
+  - dependency-name: "@oclif/parser"
+    versions:
+    - "> 3.8.4, < 4"
+  - dependency-name: promisify-child-process
+    versions:
+    - "> 4.1.0, < 5"
+  - dependency-name: query-string
+    versions:
+    - "> 6.12.0, < 7"
+  - dependency-name: react-transition-group
+    versions:
+    - "> 4.3.0, < 5"
+  - dependency-name: recharts
+    versions:
+    - "> 1.7.1, < 2"
+  - dependency-name: "@types/algoliasearch"
+    versions:
+    - "> 3.34.5, < 4"
+  - dependency-name: "@typescript-eslint/parser"
+    versions:
+    - "> 2.19.2, < 3"
+  - dependency-name: "@types/invariant"
+    versions:
+    - "> 2.2.31, < 2.3"
+  - dependency-name: "@types/react"
+    versions:
+    - "> 16.9.17, < 17"
+  - dependency-name: "@types/react-dom"
+    versions:
+    - "> 16.9.4, < 17"
+  - dependency-name: "@types/react-test-renderer"
+    versions:
+    - "> 16.9.1, < 17"
+  - dependency-name: "@types/react-virtualized"
+    versions:
+    - "> 9.21.9, < 10"
+  - dependency-name: "@types/testing-library__react"
+    versions:
+    - "> 10.0.0, < 11"
+- package-ecosystem: cargo
+  directory: "/packer"
+  schedule:
+    interval: weekly
+    time: '13:00'
+  open-pull-requests-limit: 10
+  ignore:
+  - dependency-name: data-encoding
+    versions:
+    - "> 2.2.0, < 3"
+  - dependency-name: serde
+    versions:
+    - "> 1.0.106, < 1.1"
+  - dependency-name: serde_yaml
+    versions:
+    - ">= 0.8.12.a, < 0.8.13"
+  - dependency-name: sha2
+    versions:
+    - "> 0.8.1, < 0.9"
+  - dependency-name: tar
+    versions:
+    - "> 0.4.26, < 0.5"