Add ISC license

See https://en.wikipedia.org/wiki/ISC_license.

fixtures/licenses/ISC

@@ -0,0 +1,15 @@
+ISC License
+
+Copyright (c) [year(s)], [copyright holder]
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.

license.go

@@ -11,6 +11,7 @@ import (
 const (
 	// Recognized license types
 	LicenseMIT       = "MIT"
+	LicenseISC       = "ISC"
 	LicenseNewBSD    = "NewBSD"
 	LicenseFreeBSD   = "FreeBSD"
 	LicenseApache20  = "Apache-2.0"
@@ -41,6 +42,7 @@ var DefaultLicenseFiles = []string{
 // A slice of standardized license abbreviations
 var KnownLicenses = []string{
 	LicenseMIT,
+	LicenseISC,
 	LicenseNewBSD,
 	LicenseFreeBSD,
 	LicenseApache20,
@@ -159,6 +161,10 @@ func (l *License) GuessType() error {
 		"person obtaining a copy of this software"):
 		l.Type = LicenseMIT
 
+	case scan(comp, "permission to use, copy, modify, and/or distribute this "+
+		"software for any"):
+		l.Type = LicenseISC
+
 	case scan(comp, "apache license version 2.0, january 2004") ||
 		scan(comp, "http://www.apache.org/licenses/license-2.0"):
 		l.Type = LicenseApache20