Remove import comment to make package usable when cloning from GitHub

[CrushedPixel]

Right now, calling go build github.com/trimmer-io/go-timecode/timecode yields the following error:

can't load package: package github.com/trimmer-io/go-timecode/timecode: code in directory /GOPATH/src/github.com/trimmer-io/go-timecode/timecode expects import "trimmer.io/go-timecode/timecode"

This issue also causes projects depending on timecode to fail building, so a fix is necessary. I removed the // import comment to make the package usable when cloning from GitHub.