Update Readme and changelog with notes about 1.0

Author: scottmessinger

CHANGELOG.md

@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Introduce GitHub actions, replacing Travis CI
 * Use MongoDB 1.0.0 to add support for Mongodb 4.4. and 5.0
 
+* NOTE: This might work with versions of Ecto less than 3.6.
+Refer to the ecto-3 branch if you need to find a commit that works with a non-officially supported version
+of Ecto.
+
 ### Possible breaking changes
 
   * Some upsert operations are only supported with MongoDBs 4.2 or newer.

README.md

@@ -60,7 +60,7 @@ Add `:mongodb_ecto` as a dependency in your `mix.exs` file.
 ```elixir
 def deps do
   [
-    {:mongodb_ecto, "~> 0.2"}
+    {:mongodb_ecto, "~> 1.0.0"}
   ]
 end
 ```
@@ -121,8 +121,8 @@ Additionally special values are translated as follows:
 
 ## Supported Mongo versions
 
-The adapter and the driver are tested against most recent versions from 3
-branches: 2.4.x, 2.6.x, 3.0.x
+The adapter and the driver are tested against most recent versions from 2
+branches: 4.4 and 5.0
 
 ## Contributing