Codimd: Support copying and pasting text on phone

[YYSU]

最近常使用手機做筆記，但是發現HackMD不支援手機的複製及貼上功能
如果有的話使用會更加順手， 謝謝您！
我用的是iphone7(版本 10.1.1)

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I usually make notes on HackMD with phone recently , but it doesn't support copying and pasting with phone.If the function could be added , it would be very nice!
I use iphone7(version 10.1.1).

best wishes.

[jackycute]

Hi @YYSU
This is a minor bug, but it's hard to solve.
There is a workaround: select a range of text first, and click that range again should popup the menu.