small fix in go.mod

[ernierasta]

Hi! Can you please fix go.mod?

Currently you defined package name as: module github.com/solarlune/paths but in reality your path is: github.com/SolarLune/paths.

So when I am trying to go get it:

go get: github.com/SolarLune/paths@none updating to
	github.com/SolarLune/[email protected]: parsing go.mod:
	module declares its path as: github.com/solarlune/paths
	       but was required as: github.com/SolarLune/paths

While I can go get github.com/solarlune/paths, it is confusing.

Thanks for package! Not tested yet, but looks good!