An outdated link in the README

[JacksonChen666]

In the README, a link to a specific line of code is outdated.

The link: https://github.com/tuskyapp/Tusky/blob/develop/app/src/main/res/values/donottranslate.xml#L160

The link can be replaced with the following: https://github.com/tuskyapp/Tusky/blob/059352f4718c7faa8a35a0a240a897a33a70038c/app/src/main/res/values/donottranslate.xml#L165

The second link does not highlight the wrong line in the future, but must be kept up to date if the list changes in the future, because it is locked to a specific commit.

[ashley-graves]

Fixed in PR #26