Fix version parsing when patch is missing

[jpalaz]

• update regex to parse version without patch part
• add version convertion to add fake .0 as patch

[jpalaz]

My attempt to fix https://github.com/ahmadnassri/action-dependabot-auto-merge/issues/36 issue. I couldn't run tests but checked my changes just separately and they work. Also, it's not the fix for 3-dots versions (as 1.2.3.4), only for 1-dot (as 2.0).

[ahmadnassri]

thank you, I'll take a look

[ericbuehl]

@ahmadnassri bump! would love to have this