bump sirupsen/logrus v1.4.1

Full diff: https://github.com/sirupsen/logrus/compare/v1.3.0...v1.4.1

Fixes:

- Remove dependency on golang.org/x/crypto
- Fix wrong method calls Logger.Print and Logger.Warningln
- Update Entry.Logf to not do string formatting unless the log level is enabled
- Fix infinite recursion on unknown Level.String()
- Fix race condition in getCaller
- Fix Entry.WithContext method to return a copy of the initial entry

New:

- Add DeferExitHandler, similar to RegisterExitHandler but prepending the handler to the list of handlers (semantically like defer)
- Add CallerPrettyfier to JSONFormatter and `TextFormatter`
- Add Entry.WithContext() and Entry.Context, to set a context on entries to be used e.g. in hooks
- Enhance TextFormatter to not print caller information when they are empty

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/github.com/sirupsen/logrus/alt_exit.go

@@ -51,9 +51,9 @@ func Exit(code int) {
 	os.Exit(code)
 }
 
-// RegisterExitHandler adds a Logrus Exit handler, call logrus.Exit to invoke
-// all handlers. The handlers will also be invoked when any Fatal log entry is
-// made.
+// RegisterExitHandler appends a Logrus Exit handler to the list of handlers,
+// call logrus.Exit to invoke all handlers. The handlers will also be invoked when
+// any Fatal log entry is made.
 //
 // This method is useful when a caller wishes to use logrus to log a fatal
 // message but also needs to gracefully shutdown. An example usecase could be
@@ -62,3 +62,15 @@ func Exit(code int) {
 func RegisterExitHandler(handler func()) {
 	handlers = append(handlers, handler)
 }
+
+// DeferExitHandler prepends a Logrus Exit handler to the list of handlers,
+// call logrus.Exit to invoke all handlers. The handlers will also be invoked when
+// any Fatal log entry is made.
+//
+// This method is useful when a caller wishes to use logrus to log a fatal
+// message but also needs to gracefully shutdown. An example usecase could be
+// closing database connections, or sending a alert that the application is
+// closing.
+func DeferExitHandler(handler func()) {
+	handlers = append([]func(){handler}, handlers...)
+}