improve msg

Author: php-coder

Dangerfile

@@ -438,7 +438,7 @@ else
 			# TODO: try to findout the test case and use it for highlighting line numbers
 			file = github.html_link(file)
 			testcase = tc['name']
-			fail("maven-surefire-plugin error in #{file}:\nTest case `#{testcase}` fails with message:\n#{msg}")
+			fail("maven-surefire-plugin error in #{file}:\nTest case `#{testcase}` fails with message:\n```\n#{msg}\n```")
 		end
 	end
 	print_errors_summary 'maven-surefire-plugin', errors_count, 'https://github.com/php-coder/mystamps/wiki/unit-tests'