`devel-<short sha>` is newer

Consider devel versions newer than released go versions. This may not
always be the case, but is probably the sanest default.

Changelog.md

+#v68 (2016/06/16)
+
+* `devel-<short sha>` is always considered newer than any released go version
+
 #v67 (2016/06/13)
 
 * Attempt to handle missing deps a little better.

match_test.go

@@ -71,6 +71,7 @@ func TestIsSameOrNewer(t *testing.T) {
 		{`go1.6`, `go1.6`, true},
 		{`go1.5`, `go1.6`, true},
 		{`go1.7`, `go1.6`, false},
+		{`go1.6`, `devel-8f48efb`, true}, // devel versions are always never
 	}
 
 	for _, test := range cases {

version.go

@@ -8,7 +8,7 @@ import (
 	"strings"
 )
 
-const version = 67
+const version = 68
 
 var cmdVersion = &Command{
 	Name:  "version",
@@ -39,6 +39,9 @@ func isSameOrNewer(base, check string) bool {
 	if base == check {
 		return true
 	}
+	if strings.HasPrefix(check, "devel-") {
+		return true
+	}
 	bp := strings.FieldsFunc(base, GoVersionFields)
 	cp := strings.FieldsFunc(check, GoVersionFields)
 	if len(bp) < 2 || len(cp) < 2 {