无法设置主题，导致重启halo 失败

halo version 1.4 ,1.3.2

Caused by: com.fasterxml.jackson.dataformat.yaml.snakeyaml.error.MarkedYAMLException: mapping values are not allowed here
 in 'reader', line 70, column 19:
           placeholder: '只需填入 Twitter 用户名即可'
                      ^