docs(server): add base model to readme

README.md

@@ -7,7 +7,10 @@ It is also meant to bundle as many server-side pubsweet dependencies as possible
 Install package and remove the dependencies it is meant to replace.
 
 ```sh
-yarn remove pubsweet pubsweet-server @pubsweet/logger # if migrating from an existing project
+## if migrating from an existing project
+yarn remove pubsweet pubsweet-server @pubsweet/logger @pubsweet/base-model
+##
+
 yarn add @coko/server
 ```
 
@@ -36,14 +39,6 @@ If you place this file in `server/app.js`, starting the server should work autom
 }
 ```
 
-### Logger
-
-To access the logger simply import like so:
-
-```js
-const { logger } = require('@coko/server')
-```
-
 ### Authorization middleware
 
 The server provides authorization checks through using `graphql-shield`.  
@@ -136,7 +131,26 @@ If you run your client on a different host/port than the server, you might run i
 
 ### Other exports from included packages
 
-- `createJWT` is an export of a function in `pubsweet-server` that does just that. Useful if you have custom login resolvers.
+##### Logger
+
+Returns pubsweet's logger
+
+```js
+const { logger } = require('@coko/server')
+```
+
+##### Base Model
+
+Returns pubsweet's base model
+
+```js
+const { BaseModel } = require('@coko/server')
+```
+
+##### createJWT
+
+`createJWT` is an export of a function in `pubsweet-server` that does just that.  
+Useful if you have custom login resolvers.
 
 ### Future features