Improved request errors (#286)

* worked on wrapping errors in requests.go, added defer statements

* removed .idea (generated by goland)

* added another require.NoError

* Update pkg/requests/requests.go

Co-Authored-By: Dan Bond <pm@danbond.io>

* fixed out-of-order imports

* changelog entry added

* swapped error definitions to use fmt.Errorf rather than Wrap()

* formatting changes, added new defers to requests_test.go

* suppot for go1.12 pipeline removed from travis pipeline, .idea/ added to gitignore

* Reorder changelog entry