Add <strikethrough>

Author: liamg

README.md

@@ -105,3 +105,4 @@ It's not required to close tags you've opened, though it can make for easier rea
 - `<blink>`
 - `<reverse>`
 - `<hidden>`
+- `<strikethrough>`

parser.go

@@ -30,20 +30,22 @@ const (
 	reverse
 	hidden
 	italic
+	strikethrough
 )
 
 var resetAll = "\x1b[0m"
 var resetFg = "\x1b[39m"
 var resetBg = "\x1b[49m"
 
 var attrMap = map[uint8]string{
-	bold:      "\x1b[1m",
-	dim:       "\x1b[2m",
-	italic:    "\x1b[3m",
-	underline: "\x1b[4m",
-	blink:     "\x1b[5m",
-	reverse:   "\x1b[7m",
-	hidden:    "\x1b[8m",
+	bold:          "\x1b[1m",
+	dim:           "\x1b[2m",
+	italic:        "\x1b[3m",
+	underline:     "\x1b[4m",
+	blink:         "\x1b[5m",
+	reverse:       "\x1b[7m",
+	hidden:        "\x1b[8m",
+	strikethrough: "\x1b[9m",
 }
 
 func (s *parserState) setFg(esc string) string {

tags.go

@@ -39,11 +39,12 @@ var bgTags = map[string]string{
 }
 
 var attrTags = map[string]uint8{
-	"bold":      bold,
-	"dim":       dim,
-	"italic":    italic,
-	"underline": underline,
-	"blink":     blink,
-	"reverse":   reverse,
-	"hidden":    hidden,
+	"bold":          bold,
+	"dim":           dim,
+	"italic":        italic,
+	"underline":     underline,
+	"blink":         blink,
+	"reverse":       reverse,
+	"hidden":        hidden,
+	"strikethrough": strikethrough,
 }