fix(plugin-commands-patching): leave final newline in patch files

[andersk]

The safe-execa library strips the final newline from the command output by default. Here it should be left in.

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[zkochan]

What issue is the removed newline is causing?

[zkochan]

@andersk could you answer?

[andersk]

Patch files, like all text files, should always end with a trailing newline. Patch files generated by diff and git diff end with a trailing newline, so ours should too. If the newline is missing, GitHub displays a red warning icon (example), git diff and git show warn \ No newline at end of file, and cat will incorrectly combine multiple files or cause your shell prompt to unexpectedly start in the middle of a line. This might be unlikely to cause “real” problems in practice, but many programmers like being tidy with their source trees, so their tools should be tidy with it too.

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