Fix file path lookup

Add decoder opts to unmarshal exact

Release 1.5.0

Clean up dependencies

This commit was created by manually removing github.com/ugorji/go/codec from
the go.mod (which now does not exist - see ugorji/go#299)
and running `go mod tidy`.

Closes spf13#658

Remove superflous insensitiviseMaps in Unmarshal methods

Fixes spf13#482

Make the map in MergeConfigMap case insensitive

Restrict Travis to >= Go 1.11, use Go Modules, and get the test to pass

Fix nil pointer on watch function (spf13#568)

Fix nil pointer on watch function (spf13#568)

Fix nil pointer on watch function (spf13#568)