put project to sleep

.github/dependabot.yml

@@ -1,8 +0,0 @@
-version: 2
-updates:
-- package-ecosystem: cargo
-  directory: "/"
-  schedule:
-    interval: daily
-    time: "04:00"
-  open-pull-requests-limit: 10

README.md

@@ -17,3 +17,8 @@ Read the documentation on [docs.rs](https://docs.rs/opensmtpd/).
 # Requirements
 
 Rust 1.43 or newer.
+
+
+# Status
+
+Abandoned (at least temporarily).