feat: add gomod to dependabot.yml (#137)

* add gomod to dependabot.yml

* change interval

Author: mspiekermann

.github/dependabot.yml

@@ -1,14 +1,19 @@
 version: 2
 updates:
+- package-ecosystem: gomod
+  directory: "/"
+  schedule:
+    interval: weekly
+    time: '20:00'
 - package-ecosystem: npm
   directory: "/"
   schedule:
-    interval: daily
+    interval: weekly
     time: '20:00'
   open-pull-requests-limit: 10
 - package-ecosystem: bundler
   directory: "/"
   schedule:
-    interval: daily
+    interval: weekly
     time: '20:00'
   open-pull-requests-limit: 10