v1.18.1

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Bugfixes:

• #​974: Fix nil dereference in logger constructed by zap.NewNop.

v1.18.0

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Enhancements:

• #​961: Add zapcore.BufferedWriteSyncer, a new WriteSyncer that buffers
  messages in-memory and flushes them periodically.
• #​971: Add zapio.Writer to use a Zap logger as an io.Writer.
• #​897: Add zap.WithClock option to control the source of time via the
  new zapcore.Clock interface.
• #​949: Avoid panicking in zap.SugaredLogger when arguments of *w
  methods don't match expectations.
• #​943: Add support for filtering by level or arbitrary matcher function to
  zaptest/observer.
• #​691: Comply with io.StringWriter and io.ByteWriter in Zap's
  buffer.Buffer.

Thanks to @​atrn0, @​ernado, @​heyanfu, @​hnlq715, @​zchee
for their contributions to this release.