Improve timeout in input plugins

plugins/inputs/mailchimp/chimp_api.go

@@ -10,6 +10,7 @@ import (
 	"net/url"
 	"regexp"
 	"sync"
+	"time"
 )
 
 const (
@@ -120,7 +121,10 @@ func (a *ChimpAPI) GetReport(campaignID string) (Report, error) {
 }
 
 func runChimp(api *ChimpAPI, params ReportsParams) ([]byte, error) {
-	client := &http.Client{Transport: api.Transport}
+	client := &http.Client{
+		Transport: api.Transport,
+		Timeout:   time.Duration(4 * time.Second),
+	}
 
 	var b bytes.Buffer
 	req, err := http.NewRequest("GET", api.url.String(), &b)