Update syntax to handle [ and ] in paths

syntax/startify.vim

@@ -14,8 +14,8 @@ let s:sep = startify#get_separator()
 syntax sync fromstart
 
 syntax match StartifySpecial /\V<empty buffer>\|<quit>/
-syntax match StartifyBracket /\[\|\]/
-syntax match StartifyNumber  /\[[^BSV]\+\]/hs=s+1,he=e-1 contains=StartifyBracket
+syntax match StartifyBracket /.*\%9c/ contains=StartifyNumber
+syntax match StartifyNumber  /\[[^BSTV]\{-1,2}\]/hs=s+1,he=e-1
 syntax match StartifyFile    /.*/ contains=StartifyBracket,StartifyNumber,StartifyPath,StartifySpecial
 
 execute 'syntax match StartifySlash /\'. s:sep .'/'