updated change log

CHANGELOG.rst

@@ -2,9 +2,22 @@
 Changelog
 =========
 
-Version 0.1
-===========
+Version 1.0.0
+=============
 
-- Feature A added
-- FIX: nasty bug #1729 fixed
-- add your changes here!
+- Restructuring of graph classes and module setup. The following things changed in terms of the code:
+    - renamed `node.graph` to `node.content`
+    - all operations on a graph (dependencies, ancestors, lineage, ...) return now a subgraph
+    - a graph has two new properties: `ids` and `nodes`. `ids` are the node IDs and `nodes` the nodes. Both are views
+    - `nnodes` was removed and can be replaced by calling `len(graph)`
+    - new class method `from_list` converts a list of nodes to a graph
+    - `__getitem__` method in the graph class supports indexing by integer and node ID
+    - `get_node_by_name` method in the graph class returns the first node matching a given name
+    - `nodes_at_same_level` in the graph class was renamed and adapted to `find_siblings` (all nodes having the same parent)
+- Additional tests
+
+
+Version 0.0.1
+=============
+
+- First release for the openEO API 0.4