Ignore most ESLint packages from Dependabot

Since the version of these packages are dictated by
@kevinoid/eslint-config peerDependencies, only warn when that package is
out of date.

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>

.dependabot/config.yml

@@ -0,0 +1,16 @@
+# Dependabot Configuration <https://dependabot.com/docs/config-file/>
+version: 1
+update_configs:
+- package_manager: "javascript"
+  directory: "/"
+  update_schedule: "live"
+  ignored_updates:
+  # eslint packages must be updated together due to peerDependencies.
+  # Ignore all but @kevinoid/eslint-config, which declares peerDependencies.
+  #
+  # FIXME: Want to ignore updates outside of peerDependencies (usually major).
+  # If using package-lock.json, want minor/patch.
+  # Can't currently configure update_type for ignored_updates.
+  # https://github.com/dependabot/feedback/issues/340#issuecomment-586450312
+  - match:
+      dependency_name: "eslint*"