Add changelog for 2.0.0

Author: msau42

CHANGELOG-2.0.md

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+# Changes since v1.1.0
+
+## Action Required
+
+- Introduce V(5) on the health check begin/success log lines to allow filtering of these entries from logs. If you would like to retain these log entries the action required would be to set `-v==5` or higher for the livenessprobe container. ([#57](https://github.com/kubernetes-csi/livenessprobe/pull/57), [@stefansedich](https://github.com/stefansedich))
+- Deprecated "--connection-timeout" argument has been removed. ([#59](https://github.com/kubernetes-csi/livenessprobe/pull/59), [@msau42](https://github.com/msau42))
+
+## Other Notable Changes
+
+- Fix nil pointer bug when driver responds with not ready ([#58](https://github.com/kubernetes-csi/livenessprobe/pull/58), [@scuzhanglei](https://github.com/scuzhanglei))
+- Migrated to Go modules, so the source builds also outside of GOPATH. ([#53](https://github.com/kubernetes-csi/livenessprobe/pull/53), [@pohly](https://github.com/pohly))
+
+