diff --git a/changelog.d/28.feature b/changelog.d/28.feature
new file mode 100644
index 0000000..e68676e
--- /dev/null
+++ b/changelog.d/28.feature
@@ -0,0 +1 @@
+Add support for Slack notifications. Contributed by @awesome-manuel.
diff --git a/changelog.d/29.misc b/changelog.d/29.misc
new file mode 100644
index 0000000..076b4e6
--- /dev/null
+++ b/changelog.d/29.misc
@@ -0,0 +1 @@
+Update minimum go version to 1.11.
diff --git a/changelog.d/30.misc b/changelog.d/30.misc
new file mode 100644
index 0000000..076b4e6
--- /dev/null
+++ b/changelog.d/30.misc
@@ -0,0 +1 @@
+Update minimum go version to 1.11.
diff --git a/changelog.d/31.misc b/changelog.d/31.misc
new file mode 100644
index 0000000..5daea51
--- /dev/null
+++ b/changelog.d/31.misc
@@ -0,0 +1 @@
+Replace vendored libraries with `go mod`.
diff --git a/changelog.d/32.misc b/changelog.d/32.misc
new file mode 100644
index 0000000..79c5a8b
--- /dev/null
+++ b/changelog.d/32.misc
@@ -0,0 +1 @@
+Add Dockerfile. Contributed by @awesome-manuel.
diff --git a/slack.go b/slack.go
index 5159bc5..141a307 100644
--- a/slack.go
+++ b/slack.go
@@ -1,9 +1,9 @@
 package main
 
 import (
-	"strings"
 	"fmt"
 	"net/http"
+	"strings"
 )
 
 type slackClient struct {