module: run go mod tidy && go mod vendor

vendor/github.com/btcsuite/btclog/doc.go

@@ -0,0 +1,27 @@
+// Copyright (c) 2013-2017 The btcsuite developers
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+/*
+Package btclog defines an interface and default implementation for subsystem
+logging.
+
+Log level verbosity may be modified at runtime for each individual subsystem
+logger.
+
+The default implementation in this package must be created by the Backend type.
+Backends can write to any io.Writer, including multi-writers created by
+io.MultiWriter.  Multi-writers allow log output to be written to many writers,
+including standard output and log files.
+
+Optional logging behavior can be specified by using the LOGFLAGS environment
+variable and overridden per-Backend by using the WithFlags call option. Multiple
+LOGFLAGS options can be specified, separated by commas.  The following options
+are recognized:
+
+  longfile: Include the full filepath and line number in all log messages
+
+  shortfile: Include the filename and line number in all log messages.
+  Overrides longfile.
+*/
+package btclog