2.1.3 bug fix and style optimization

2.1.3 (2021-07-08)

[feat]: update readme file (281fe6f)
[fix]: change delete icon, fix save error as well as optimize update dialog (46d7ff6)
[fix]: export default name (028006a)
[fix]: fix init language and mac head title location (caba2fb)
[fix]: fix picgo server notification sender (334498b)
[fix]: fix save button and export notification (9b933b8)
[fix]: fix translation error in table tool bar (1e17718)
[fix]: fix unsaved dot color in windows and disable export png in no-current note (75b3521)
[fix]: optimize editor button and add lock notification (b2b48ce)
[fix]: update readme file (1886ee2)
[fix]:theme header color (6c20434)