dub strips newline at end of dub.json

[Moth-Tolias]

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System information

• dub version: 1.27.0
• OS Platform and distribution: windows 8
• compiler version: 2.098.0-dirty

Bug Description

dub strips the newline at the end of dub.json files when editing.

How to reproduce

• manually edit or create a dub.json file with a newline at end of file
• use dub to edit the file, e.g. dub add fixedstring
• observe that the newline at end of file has been removed

Expected Behavior

dub should leave the newline at the end of files alone, as per convention.