gup version**

v0.27.1

Description (About the problem)

gup's version comparison is using a simple lexicographic string comparison. This does not work properly e.g. when the number of digits in a version changes.

Steps to reproduce

Example case added in #159 -- 1.2.0 is treated as newer than 1.11.5.

Expected behavior

1.2.0 is older than 1.11.5.

Additional details**

I don't know if the version comparison implementation used by go mod is exposed somewhere. But that would be a good one to use for this.