Updated the reference to new go-pivnet v7.0.1

[#177105083](https://www.pivotaltracker.com/story/show/177105083)

Author: cjnosal

go.mod

@@ -17,7 +17,7 @@ require (
 	github.com/mitchellh/colorstring v0.0.0-20150917214807-8631ce90f286 // indirect
 	github.com/onsi/ginkgo v1.12.0
 	github.com/onsi/gomega v1.9.0
-	github.com/pivotal-cf/go-pivnet/v7 v7.0.0
+	github.com/pivotal-cf/go-pivnet/v7 v7.0.1
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/robdimsdale/sanitizer v0.0.0-20160522134901-ab2334cb7539
 	github.com/shirou/gopsutil v2.17.12+incompatible // indirect