Update logrus to v1.6.0

Fixes #3223 by bumping logrus to v1.6.0, which in turn bumps
github.com/konsorten/go-windows-terminal-sequences to v1.0.3
wherein the fix to bad pointer is found.

Signed-off-by: Andreas Hassing <andreas@famhassing.dk>

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

@@ -68,10 +68,10 @@ func (mw *MutexWrap) Disable() {
 // `Out` and `Hooks` directly on the default logger instance. You can also just
 // instantiate your own:
 //
-//    var log = &Logger{
+//    var log = &logrus.Logger{
 //      Out: os.Stderr,
-//      Formatter: new(JSONFormatter),
-//      Hooks: make(LevelHooks),
+//      Formatter: new(logrus.JSONFormatter),
+//      Hooks: make(logrus.LevelHooks),
 //      Level: logrus.DebugLevel,
 //    }
 //
@@ -100,8 +100,9 @@ func (logger *Logger) releaseEntry(entry *Entry) {
 	logger.entryPool.Put(entry)
 }
 
-// Adds a field to the log entry, note that it doesn't log until you call
-// Debug, Print, Info, Warn, Error, Fatal or Panic. It only creates a log entry.
+// WithField allocates a new entry and adds a field to it.
+// Debug, Print, Info, Warn, Error, Fatal or Panic must be then applied to
+// this new returned entry.
 // If you want multiple fields, use `WithFields`.
 func (logger *Logger) WithField(key string, value interface{}) *Entry {
 	entry := logger.newEntry()