Fix U.S. PROB group handling and trim RMK from remark

internal/parser/lexer.go

@@ -6,7 +6,7 @@ import (
 
 var lex = lexer.MustSimple([]lexer.SimpleRule{
 	{Name: "header", Pattern: `TAF (AMD|COR)? ?`},
-	{Name: "Remark", Pattern: `RMK .*`},
+	{Name: "Remark", Pattern: `RMK[^\n]*`},
 	{Name: "Number", Pattern: `\d+`},
 	{Name: "Modifier", Pattern: `[+-]|VC`},
 	{Name: "Prob", Pattern: "PROB"},

internal/parser/parser.go

@@ -34,8 +34,8 @@ type ValidPair struct {
 
 type Probability struct {
 	Pos   lexer.Position
-	Value string `Prob @Number`
-	Time  string `(WS @Number)?`
+	Value string    `Prob @Number`
+	Valid ValidPair `(WS @@)?`
 }
 
 type WindSpeed struct {