Add Change log for v1.1

CHANGELOG-1.1.md

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+# Changelog since v1.0.1
+
+## Deprecations
+* Command line flag `--connection-timeout` is deprecated and has no effect.
+* Command line flag `--snapshotter` is deprecated and has no effect ([#103](https://github.com/kubernetes-csi/external-snapshotter/pull/103))
+
+## Notable Features
+* Add Lease based Leader Election Support ([#107](https://github.com/kubernetes-csi/external-snapshotter/pull/107))
+* The external snapshotter now tries to connect to the CSI driver indefinitely ([#92](https://github.com/kubernetes-csi/external-snapshotter/pull/92))
+* A new --timeout parameter has been added for CSI operations ([#93](https://github.com/kubernetes-csi/external-snapshotter/pull/93))
+* Prow testing ([#111](https://github.com/kubernetes-csi/external-snapshotter/pull/111))
+
+## Other Notable Changes
+* Add PR template ([#113](https://github.com/kubernetes-csi/external-snapshotter/pull/113))
+* Un-prune code-generator scripts ([#110](https://github.com/kubernetes-csi/external-snapshotter/pull/110))
+* Refactor external snapshotter to use csi-lib-utils/rpc ([#97](https://github.com/kubernetes-csi/external-snapshotter/pull/97))
+* Fix for pre-bound snapshot empty source error ([#98](https://github.com/kubernetes-csi/external-snapshotter/pull/98))
+* Update vendor to k8s 1.14.0 ([#105](https://github.com/kubernetes-csi/external-snapshotter/pull/105))
+* Migrate to k8s.io/klog from glog. ([#88](https://github.com/kubernetes-csi/external-snapshotter/pull/88))
+* Use distroless as base image ([#101](https://github.com/kubernetes-csi/external-snapshotter/pull/101))
+* Remove constraints and update all vendor pkgs ([#100](https://github.com/kubernetes-csi/external-snapshotter/pull/100))
+* Add dep prune options and remove unused packages ([#99](https://github.com/kubernetes-csi/external-snapshotter/pull/99))
+* Release tools ([#86](https://github.com/kubernetes-csi/external-snapshotter/pull/86))