Use Go1.11 module (#5743)

* Migrate to go modules

* make vendor

* Update mvdan.cc/xurls

* make vendor

* Update code.gitea.io/git

* make fmt-check

* Update github.com/go-sql-driver/mysql

* make vendor

vendor/github.com/sergi/go-diff/CONTRIBUTORS

@@ -0,0 +1,32 @@
+# This is the official list of people who can contribute
+# (and typically have contributed) code to the go-diff
+# repository.
+#
+# The AUTHORS file lists the copyright holders; this file
+# lists people.  For example, ACME Inc. employees would be listed here
+# but not in AUTHORS, because ACME Inc. would hold the copyright.
+#
+# When adding J Random Contributor's name to this file,
+# either J's name or J's organization's name should be
+# added to the AUTHORS file.
+#
+# Names should be added to this file like so:
+#     Name <email address>
+#
+# Please keep the list sorted.
+
+Danny Yoo <dannyyoo@google.com>
+James Kolb <jkolb@google.com>
+Jonathan Amsterdam <jba@google.com>
+Markus Zimmermann <markus.zimmermann@nethead.at> <markus.zimmermann@symflower.com> <zimmski@gmail.com>
+Matt Kovars <akaskik@gmail.com>
+Örjan Persson <orjan@spotify.com>
+Osman Masood <oamasood@gmail.com>
+Robert Carlsen <rwcarlsen@gmail.com>
+Rory Flynn <roryflynn@users.noreply.github.com>
+Sergi Mansilla <sergi.mansilla@gmail.com>
+Shatrugna Sadhu <ssadhu@apcera.com>
+Shawn Smith <shawnpsmith@gmail.com>
+Stas Maksimov <maksimov@gmail.com>
+Tor Arvid Lund <torarvid@gmail.com>
+Zac Bergquist <zbergquist99@gmail.com>