Make git clone work on Windows

[wtwhite]

Attempting git clone on Windows fails due to a colon in the filename src/test/resources/artifacts/org.apache.commons:commons-collections4.json:

C:\Users\walto\Documents\code>git clone git@github.com:jensdietrich/shadedetector.git
Cloning into 'shadedetector'...
remote: Enumerating objects: 2481, done.
remote: Counting objects: 100% (476/476), done.
remote: Compressing objects: 100% (266/266), done.
remote: Total 2481 (delta 166), reused 392 (delta 92), pack-reused 2005
Receiving objects: 100% (2481/2481), 971.22 KiB | 991.00 KiB/s, done.
Resolving deltas: 100% (1295/1295), done.
error: invalid path 'src/test/resources/artifacts/org.apache.commons:commons-collections4.json'
fatal: unable to checkout working tree
warning: Clone succeeded, but checkout failed.
You can inspect what was checked out with 'git status'
and retry with 'git restore --source=HEAD :/'

Changing the colon to an exclamation mark fixes this. mvn package succeeds before and after this change.