improve err format

Author: php-coder

Dangerfile

@@ -119,13 +119,13 @@ else
 		error_msgs = errors.join("\n")
 		if errors_cnt == 1
 			fail("license plugin reports about #{errors_cnt} error:\n"\
-				"#{error_msgs}\n"\
-				"Please, fix it by executing `mvn license:format`.\n"\
+				"```\n#{error_msgs}\n```\n"\
+				"Please, fix it by executing `mvn license:format`\n"\
 				"See also: <a href=\"#{link}\">#{link}</a>")
 		elsif errors_cnt > 1
 			fail("license plugin reports about #{errors_cnt} errors:\n"\
-				"#{error_msgs}\n"\
-				"Please, fix them by executing `mvn license:format`.\n"\
+				"```\n#{error_msgs}\n```\n"\
+				"Please, fix them by executing `mvn license:format`\n"\
 				"See also: <a href=\"#{link}\">#{link}</a>")
 		end
 	end
@@ -158,13 +158,13 @@ else
 		error_msgs = errors.join("\n")
 		if errors_cnt == 1
 			fail("sortpom plugin reports about #{errors_cnt} error:\n"\
-				"#{error_msgs}\n"\
-				"Please, fix it by executing `mvn sortpom:sort`.\n"\
+				"```\n#{error_msgs}\n```\n"\
+				"Please, fix it by executing `mvn sortpom:sort`\n"\
 				"See also: <a href=\"#{link}\">#{link}</a>")
 		elsif errors_cnt > 1
 			fail("sortpom plugin reports about #{errors_cnt} errors:\n"\
-				"#{error_msgs}\n"\
-				"Please, fix them by executing `mvn sortpom:sort`.\n"\
+				"```\n#{error_msgs}\n```\n"\
+				"Please, fix them by executing `mvn sortpom:sort`\n"\
 				"See also: <a href=\"#{link}\">#{link}</a>")
 		end
 	end