[Issue 18857] New: [std.experimental.logger] use NullLogger as the default

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18857

          Issue ID: 18857
           Summary: [std.experimental.logger] use NullLogger as the
                    default
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: singingbush at hotmail.com

use NullLogger as the default instead of outputting to stderr

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