adjust code excerpt line trimming

Author: Vadim Demedes

lib/code-excerpt.js

@@ -19,7 +19,7 @@ module.exports = (file, line, options) => {
 
 	const lines = excerpt.map(item => ({
 		line: item.line,
-		value: truncate(item.value, maxWidth - String(line).length - 1)
+		value: truncate(item.value, maxWidth - String(line).length - 5)
 	}));
 
 	const joinedLines = lines.map(line => line.value).join('\n');