Added changelog

CHANGELOG.md

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+## 0.2.0 (22. September 2019)
+
+Improved merging of blocks. Previously map attributes in inputs block with same name would cause an error with duplicate attributes. With this release it will merge the maps together.
+
+`common_auto.hcl`
+
+```terraform
+inputs {
+    tags = {
+        costCenter = "IT"
+        resource = "Kubernetes"
+    }
+}
+```
+
+`kubernetes.hcl`
+
+```terraform
+inputs {
+    tags = {
+        responsible = "noreply@email.com"
+    }
+}
+```
+
+Merging these 2 files together will now result in a map with `costCenter`, `resource` and `responsible` all defined.
+
+FEATURES:
+
+* Support merging items in input maps together [#13](https://github.com/avinor/tau/issues/13)
+
+IMPROVEMENTS:
+
+* Checks that `environment_variables` are not maps or lists
+* Improved merging of `backend`, `environment_variables` and `inputs`.
+
+## 0.1.0 (18. September 2019)
+
+First release that can be used for deployments in pipeline. This is still a bit work in progress, but stable enough to include in deployments scripts.