Fix linter issues

README.md

@@ -260,7 +260,7 @@ without or minimal adjustments:
       Name: "google",
       Check: func(ctx context.Context) error {
          deadline, _ := ctx.Deadline()
-         timeout := time.Now().Sub(deadline)
+         timeout := time.Since(deadline)
          return healthcheck.HTTPGetCheck("https://www.google.com", timeout)()
       },
   }),

examples/compatibiltiy/heptiolabs/main.go

@@ -16,7 +16,7 @@ func main() {
 				Name: "google",
 				Check: func(ctx context.Context) error {
 					deadline, _ := ctx.Deadline()
-					timeout := time.Now().Sub(deadline)
+					timeout := time.Since(deadline)
 					return healthcheck.HTTPGetCheck("https://www.google.com", timeout)()
 				},
 			}),

handler.go

@@ -75,6 +75,7 @@ func NewHandler(checker Checker, options ...HandlerOption) http.HandlerFunc {
 		// Write HTTP response
 		disableResponseCache(w)
 		statusCode := mapHTTPStatusCode(result.Status, cfg.statusCodeUp, cfg.statusCodeDown)
+		//nolint:errcheck
 		cfg.resultWriter.Write(&result, statusCode, w, r)
 	}
 }

interceptors/logging.go

@@ -14,7 +14,7 @@ func BasicLogger() health.Interceptor {
 			now := time.Now()
 			result := next(ctx, name, state)
 			log.Printf("executed health check function of component %s in %f seconds (result: %s)",
-				name, time.Now().Sub(now).Seconds(), result.Status)
+				name, time.Since(now).Seconds(), result.Status)
 			return result
 		}
 	}

middleware/logging.go

@@ -14,7 +14,7 @@ func BasicLogger() health.Middleware {
 			now := time.Now()
 			result := next(r)
 			log.Printf("processed health check request in %f seconds (result: %s)",
-				time.Now().Sub(now).Seconds(), result.Status)
+				time.Since(now).Seconds(), result.Status)
 			return result
 		}
 	}