* Change go.mod

Merge pull request tealeg#475 from tealeg/port-to-go-modules

Port this library to build using Go modules and drop old go versions.

Fix cases where we expect String to return an error

Use FormattedValue instead of String

Make String() return just string, and use FormattedValue when an erro…

…r is required.

Merge pull request tealeg#301 from tealeg/treat-hours-correctly

Treat hours correctly

Moved go1.1.2 tag onto latest revision

Update README with an example.

go fmt

Go1