add man page for version subcommand

diff --git a/src/etc/man/cargo-version.1 b/src/etc/man/cargo-version.1
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+++ b/src/etc/man/cargo-version.1
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+.TH "CARGO\-VERSION" "1" "May 2016" "The Rust package manager" "Cargo Manual"
+.hy
+.SH NAME
+.PP
+cargo\-version \- Show version information
+.SH SYNOPSIS
+.PP
+\f[I]cargo version\f[] [OPTIONS]
+.SH OPTIONS
+.TP
+.B \-h, \-\-help
+Print this message.
+.RS
+.RE
+.TP
+.B \-v, \-\-verbose
+Use verbose output.
+.RS
+.RE
+.TP
+.B \-\-color \f[I]WHEN\f[]
+Coloring: auto, always, never.
+.RS
+.RE
+.SH SEE ALSO
+.PP
+cargo(1)
+.SH COPYRIGHT
+.PP
+This work is dual\-licensed under Apache 2.0 and MIT terms.
+See \f[I]COPYRIGHT\f[] file in the cargo source distribution.