go.mod: vendor golangci-lint

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+About:
+
+The unconvert program analyzes Go packages to identify unnecessary
+type conversions; i.e., expressions T(x) where x already has type T.
+
+Install:
+
+    $ go get github.com/mdempsky/unconvert
+
+Usage:
+
+    $ unconvert -v bytes fmt
+    GOROOT/src/bytes/reader.go:117:14: unnecessary conversion
+                    abs = int64(r.i) + offset
+                               ^
+    GOROOT/src/fmt/print.go:411:21: unnecessary conversion
+            p.fmt.integer(int64(v), 16, unsigned, udigits)
+                               ^
+
+Flags:
+
+Using the -v flag, unconvert will also print the source line and a
+caret to indicate the unnecessary conversion's position therein.
+
+Using the -apply flag, unconvert will rewrite the Go source files
+without the unnecessary type conversions.
+
+Using the -all flag, unconvert will analyze the Go packages under all
+possible GOOS/GOARCH combinations, and only identify conversions that
+are unnecessary in all cases.
+
+E.g., syscall.Timespec's Sec and Nsec fields are int64 under
+linux/amd64 but int32 under linux/386.  An int64(ts.Sec) conversion
+that appears in a linux/amd64-only file will be identified as
+unnecessary, but it will be preserved if it occurs in a file that's
+compiled for both linux/amd64 and linux/386.