Fixed bug with converting short hex color to long

badge.go

@@ -220,7 +220,9 @@ func formatColor(c string) string {
 
 	// Short hex
 	if len(c) == 3 {
-		c = c + c
+		c = strings.Repeat(string(c[0]), 2) +
+			strings.Repeat(string(c[1]), 2) +
+			strings.Repeat(string(c[2]), 2)
 	}
 
 	return c

badge_test.go

@@ -148,7 +148,7 @@ func (s *BadgeSuite) TestBlackAndWhite(c *C) {
 func (s *BadgeSuite) TestAux(c *C) {
 	c.Assert(formatColor("000000"), Equals, "000000")
 	c.Assert(formatColor("#000000"), Equals, "000000")
-	c.Assert(formatColor("#000"), Equals, "000000")
+	c.Assert(formatColor("#4c1"), Equals, "44cc11")
 
 	c.Assert(calcLumColor(0.7), Equals, 0.4479884124418833)
 	c.Assert(calcLumColor(0.01), Equals, 0.0007739938080495357)