Vendor main dependencies.

vendor/github.com/mvdan/xurls/LICENSE

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+Copyright (c) 2015, Daniel Martí. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of the copyright holder nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/mvdan/xurls/schemes.go

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+// Copyright (c) 2015, Daniel Martí <mvdan@mvdan.cc>
+// See LICENSE for licensing information
+
+package xurls
+
+// SchemesNoAuthority is a sorted list of some well-known url schemes that are
+// followed by ":" instead of "://". Since these are more prone to false
+// positives, we limit their matching.
+var SchemesNoAuthority = []string{
+	`bitcoin`, // Bitcoin
+	`file`,    // Files
+	`magnet`,  // Torrent magnets
+	`mailto`,  // Mail
+	`sms`,     // SMS
+	`tel`,     // Telephone
+	`xmpp`,    // XMPP
+}

vendor/github.com/mvdan/xurls/tlds_pseudo.go

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+// Copyright (c) 2015, Daniel Martí <mvdan@mvdan.cc>
+// See LICENSE for licensing information
+
+package xurls
+
+// PseudoTLDs is a sorted list of some widely used unofficial TLDs.
+//
+// Sources:
+//  * https://en.wikipedia.org/wiki/Pseudo-top-level_domain
+//  * https://en.wikipedia.org/wiki/Category:Pseudo-top-level_domains
+//  * https://tools.ietf.org/html/draft-grothoff-iesg-special-use-p2p-names-00
+//  * https://www.iana.org/assignments/special-use-domain-names/special-use-domain-names.xhtml
+var PseudoTLDs = []string{
+	`bit`,       // Namecoin
+	`example`,   // Example domain
+	`exit`,      // Tor exit node
+	`gnu`,       // GNS by public key
+	`i2p`,       // I2P network
+	`invalid`,   // Invalid domain
+	`local`,     // Local network
+	`localhost`, // Local network
+	`onion`,     // Tor hidden services
+	`test`,      // Test domain
+	`zkey`,      // GNS domain name
+}

vendor/github.com/mvdan/xurls/xurls.go

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+// Copyright (c) 2015, Daniel Martí <mvdan@mvdan.cc>
+// See LICENSE for licensing information
+
+// Package xurls extracts urls from plain text using regular expressions.
+package xurls
+
+import "regexp"
+
+//go:generate go run generate/tldsgen/main.go
+//go:generate go run generate/regexgen/main.go
+
+const (
+	letter    = `\p{L}`
+	number    = `\p{N}`
+	iriChar   = letter + number
+	currency  = `\p{Sc}`
+	otherSymb = `\p{So}`
+	endChar   = iriChar + `/\-+_&~*%=#` + currency + otherSymb
+	midChar   = endChar + `@.,:;'?!|`
+	wellParen = `\([` + midChar + `]*(\([` + midChar + `]*\)[` + midChar + `]*)*\)`
+	wellBrack = `\[[` + midChar + `]*(\[[` + midChar + `]*\][` + midChar + `]*)*\]`
+	wellBrace = `\{[` + midChar + `]*(\{[` + midChar + `]*\}[` + midChar + `]*)*\}`
+	wellAll   = wellParen + `|` + wellBrack + `|` + wellBrace
+	pathCont  = `([` + midChar + `]*(` + wellAll + `|[` + endChar + `])+)+`
+	comScheme = `[a-zA-Z][a-zA-Z.\-+]*://`
+	scheme    = `(` + comScheme + `|` + otherScheme + `)`
+
+	iri      = `[` + iriChar + `]([` + iriChar + `\-]*[` + iriChar + `])?`
+	domain   = `(` + iri + `\.)+`
+	octet    = `(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])`
+	ipv4Addr = `\b` + octet + `\.` + octet + `\.` + octet + `\.` + octet + `\b`
+	ipv6Addr = `([0-9a-fA-F]{1,4}:([0-9a-fA-F]{1,4}:([0-9a-fA-F]{1,4}:([0-9a-fA-F]{1,4}:([0-9a-fA-F]{1,4}:[0-9a-fA-F]{0,4}|:[0-9a-fA-F]{1,4})?|(:[0-9a-fA-F]{1,4}){0,2})|(:[0-9a-fA-F]{1,4}){0,3})|(:[0-9a-fA-F]{1,4}){0,4})|:(:[0-9a-fA-F]{1,4}){0,5})((:[0-9a-fA-F]{1,4}){2}|:(25[0-5]|(2[0-4]|1[0-9]|[1-9])?[0-9])(\.(25[0-5]|(2[0-4]|1[0-9]|[1-9])?[0-9])){3})|(([0-9a-fA-F]{1,4}:){1,6}|:):[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){7}:`
+	ipAddr   = `(` + ipv4Addr + `|` + ipv6Addr + `)`
+	site     = domain + gtld
+	hostName = `(` + site + `|` + ipAddr + `)`
+	port     = `(:[0-9]*)?`
+	path     = `(/|/` + pathCont + `?|\b|$)`
+	webURL   = hostName + port + path
+
+	strict  = `(\b` + scheme + pathCont + `)`
+	relaxed = `(` + strict + `|` + webURL + `)`
+)
+
+var (
+	// Relaxed matches all the urls it can find.
+	Relaxed = regexp.MustCompile(relaxed)
+	// Strict only matches urls with a scheme to avoid false positives.
+	Strict = regexp.MustCompile(strict)
+)
+
+func init() {
+	Relaxed.Longest()
+	Strict.Longest()
+}
+
+// StrictMatchingScheme produces a regexp that matches urls like Strict but
+// whose scheme matches the given regular expression.
+func StrictMatchingScheme(exp string) (*regexp.Regexp, error) {
+	strictMatching := `(\b(?i)(` + exp + `)(?-i)` + pathCont + `)`
+	re, err := regexp.Compile(strictMatching)
+	if err != nil {
+		return nil, err
+	}
+	re.Longest()
+	return re, nil
+}