Current behavior

It seems that the latest version does not support markdown icons. icons are listing below. https://gist.github.com/rxaviers/7360908

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Expected behavior

This is a snowflake, but not show in my windows desktop application and in mac behaves the same.

1，:snowflake: 概述

It is supposed to be ❄️. while in the application preview, it just shows the word : snowflake :

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Environment

• Version : Boost Note Beta
• OS Version and name : win10 and OSX10.14

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