GPLv3 has inconsistent use of spaces

[OleMussmann]

Checklist before submitting a bug report

• I have checked the existing issues and couldn't find an issue about this bug.

Bug details

Describe the bug

In the template file of GPLv3 there is inconsistent spacing for the two sets of replaced elements. Compare lines 635 (single space between year and author) and 655 (double space between year and author)

To Reproduce

Steps to reproduce the behavior:

1. install copier
2. run copier copy ...
3. Select GPL v3
4. Read LICENSE file

Expected behavior

Spacing should be consistent in both lines, probably double spaces, see GPLv3 license text.

[egpbos]

Fixed in #687.