Bump github.com/zorkian/go-datadog-api

Bumps [github.com/zorkian/go-datadog-api](https://github.com/zorkian/go-datadog-api) from 2.26.0+incompatible to 2.28.0+incompatible.
- [Release notes](https://github.com/zorkian/go-datadog-api/releases)
- [Commits](zorkian/go-datadog-api@v2.26.0...v2.28.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

go.mod

@@ -17,7 +17,7 @@ require (
 	github.com/sirupsen/logrus v1.4.2
 	github.com/spf13/cobra v0.0.6
 	github.com/stretchr/testify v1.4.0
-	github.com/zorkian/go-datadog-api v2.26.0+incompatible
+	github.com/zorkian/go-datadog-api v2.28.0+incompatible
 	golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421 // indirect
 	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
 	gopkg.in/yaml.v2 v2.2.8

go.sum

@@ -214,6 +214,8 @@ github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q
 github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
 github.com/zorkian/go-datadog-api v2.26.0+incompatible h1:mljeL9ywBmiDEAKGH8Fg6Mfb3I8T6JMVDd5QQbgRGKI=
 github.com/zorkian/go-datadog-api v2.26.0+incompatible/go.mod h1:PkXwHX9CUQa/FpB9ZwAD45N1uhCW4MT/Wj7m36PbKss=
+github.com/zorkian/go-datadog-api v2.28.0+incompatible h1:bh/2jIkDFCZRjkuQKBFdmB+sScAMXf8fctKTT0ae+wE=
+github.com/zorkian/go-datadog-api v2.28.0+incompatible/go.mod h1:PkXwHX9CUQa/FpB9ZwAD45N1uhCW4MT/Wj7m36PbKss=
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.uber.org/atomic v1.3.2/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=