Add changelogs for LKE 1.5.1 and 1.6.0

src/content/changelog/lke-1-5.1.md

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+---
+title: Linode Kubernetes Engine v1.5.1
+date: 2020-07-20T05:00:00.000Z
+version: 1.5.1
+changelog:
+  - Linode Kubernetes Engine
+---
+
+### Changed
+
+* Add support for Kubernetes control plane version 1.16.13 and 1.17.9 with
+  upstream bug fixes. All clusters were upgraded to these versions
+
+### Fixed
+
+* Fixed an issue with etcd backups not restoring in some cases
+

src/content/changelog/lke-1-6-0.md

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+---
+title: Linode Kubernetes Engine v1.6.0
+date: 2020-08-03T05:00:00.000Z
+version: 1.6.0
+changelog:
+  - Linode Kubernetes Engine
+---
+
+### Added
+
+* Add Node Pool Recycle feature so that users can redeploy Nodes with the
+  latest patches and kubelet version
+* Add support for up to 126 Nodes per cluster
+* Add NFS packages to Node disk images. All newly deployed Nodes have NFS
+  support. Existing Node pools can gain support using the "Recycle Nodes"
+  feature
+
+### Changed
+
+* LKE Node labels are reapplied on Node startup to ensure that they persist
+  between reboots
+* Update CCM version to 0.3.6 to include a bugfix for TLS configuration
+* Increased timeout on kube-apiserver loadbalancers to prevent premature
+  termination of connections
+
+### Fixed
+
+* Address connectivity issue for connections opened by control plane to cluster
+  workloads
+