replace email processing reactions; update deps

vendor/gitlab.com/etke.cc/go/healthchecks/v2/healthchecks.go

@@ -6,12 +6,19 @@ import (
 	"github.com/google/uuid"
 )
 
-// DefaultAPI base url for checks
-const DefaultAPI = "https://hc-ping.com"
+const (
+	// DefaultAPI base url for checks
+	DefaultAPI = "https://hc-ping.com"
+	// DefaultUserAgent for the client
+	DefaultUserAgent = "Go-Healthchecks (lib; +https://gitlab.com/etke.cc/go/healthchecks)"
+)
 
 // ErrLog used to log errors occurred during an operation
 type ErrLog func(operation string, err error)
 
+// global client
+var global *Client
+
 // DefaultErrLog if you don't provide one yourself
 var DefaultErrLog = func(operation string, err error) {
 	fmt.Printf("healtchecks operation %q failed: %v\n", operation, err)
@@ -25,5 +32,18 @@ func New(options ...Option) *Client {
 	}
 	c.init(options...)
 
+	if global == nil {
+		global = c
+	}
+
 	return c
 }
+
+// Global healthchecks client
+func Global() *Client {
+	if global == nil {
+		global = New()
+	}
+
+	return global
+}