Bump version to v1.9.1

CHANGELOG.md

 # Release Notes
 
-## Version 1.9.0- 2020-03-26
+## Version 1.9.1 - 2020-04-02
+
+Improvements:
+
+* add delete-on-failure flag [#7345](https://github.com/kubernetes/minikube/pull/7345)
+* Run dashboard with internal kubectl if not in path [#7299](https://github.com/kubernetes/minikube/pull/7299)
+* Implement options for the minikube version command [#7325](https://github.com/kubernetes/minikube/pull/7325)
+* service list cmd: display target port and name  [#6879](https://github.com/kubernetes/minikube/pull/6879)
+* none: check for docker and root uid [#7388](https://github.com/kubernetes/minikube/pull/7388)
+* Update Japanese translations [#7359](https://github.com/kubernetes/minikube/pull/7359)
+* Add rejection reason to 'unable to find driver' error [#7379](https://github.com/kubernetes/minikube/pull/7379)
+
+Bug fixes:
+
+* Make eviction and image GC settings consistent across kubeadm API versions [#7364](https://github.com/kubernetes/minikube/pull/7364)
+* Move errors and warnings to output to stderr [#7382](https://github.com/kubernetes/minikube/pull/7382)
+* Correct assumptions for forwarded hostname & IP handling [#7360](https://github.com/kubernetes/minikube/pull/7360)
+* Run sudo for file display due to umask [#7384](https://github.com/kubernetes/minikube/pull/7384)
+* Make live cache pushes non-fatal in case of stop/delete race [#7362](https://github.com/kubernetes/minikube/pull/7362)
+* Extend maximum stop retry from 30s to 120s [#7363](https://github.com/kubernetes/minikube/pull/7363)
+* Use kubectl version --short if --output=json fails [#7356](https://github.com/kubernetes/minikube/pull/7356)
+* Fix embed certs by updating kubeconfig after certs are populated [#7309](https://github.com/kubernetes/minikube/pull/7309)
+* none: Use LookPath to verify conntrack install [#7305](https://github.com/kubernetes/minikube/pull/7305)
+* Show all global flags in options command [#7292](https://github.com/kubernetes/minikube/pull/7292)
+* Fix null deref in start host err [#7278](https://github.com/kubernetes/minikube/pull/7278)
+* Fix StartHost error formatting mistake, improve err msg [#7277](https://github.com/kubernetes/minikube/pull/7277)
+* Increase Docker "slow" timeouts to 15s [#7268](https://github.com/kubernetes/minikube/pull/7268)
+* mustload: Replace DriverIP with Forwarded(IP|Port) [#7310](https://github.com/kubernetes/minikube/pull/7310)
+
+Thank you to our contributors for this release!
+
+- Anders F Björklund
+- Dan Lorenc
+- Eberhard Wolff
+- John Laswell
+- Marcin Niemira
+- Medya Ghazizadeh
+- Prasad Katti
+- Priya Wadhwa
+- Sharif Elgamal
+- Thomas Strömberg
+- Vincent Link
+- anencore94
+- priyawadhwa
+- re;i
+- tomocy
+
+## Version 1.9.0 - 2020-03-26
 
 New features & improvements
 

Makefile

@@ -15,7 +15,7 @@
 # Bump these on release - and please check ISO_VERSION for correctness.
 VERSION_MAJOR ?= 1
 VERSION_MINOR ?= 9
-VERSION_BUILD ?= 0
+VERSION_BUILD ?= 1
 RAW_VERSION=$(VERSION_MAJOR).$(VERSION_MINOR).$(VERSION_BUILD)
 VERSION ?= v$(RAW_VERSION)
 
@@ -23,7 +23,7 @@ KUBERNETES_VERSION ?= $(shell egrep "DefaultKubernetesVersion =" pkg/minikube/co
 KIC_VERSION ?= $(shell egrep "Version =" pkg/drivers/kic/types.go | cut -d \" -f2)
 
 # Default to .0 for higher cache hit rates, as build increments typically don't require new ISO versions
-ISO_VERSION ?= v$(VERSION_MAJOR).$(VERSION_MINOR).$(VERSION_BUILD)
+ISO_VERSION ?= v$(VERSION_MAJOR).$(VERSION_MINOR).0
 # Dashes are valid in semver, but not Linux packaging. Use ~ to delimit alpha/beta
 DEB_VERSION ?= $(subst -,~,$(RAW_VERSION))
 RPM_VERSION ?= $(DEB_VERSION)