Well,
Knowing basically nothing about modding Factorio I did try modifying version 0.18.7 and got it working (no extensive testing done though) :)
Versioning is wrong, but that should be possible to fix as well.
Basically i extracted the zip file, and modified the file info.json to the following content:
{
"name": "WellPlanner",
"version": "1.1.0",
"title": "Well Planner",
"author": "Gloin the Dark",
"description": "Automatically layout pumpjack fields.",
"factorio_version": "1.1",
"dependencies": [
"base >= 1.1.0"
]
}
Folder in the zipfile is still called WellPlanner_0.18.7
Zipfile itself is renamed to WellPlanner_1.1.0.zip
Using this new zip-file seems to be working so far....