Update README.md (#259)

Author: devbugging

README.md

@@ -22,22 +22,6 @@ make run
 
 When running locally, the GraphQL playground is available at [http://localhost:8080/](http://localhost:8080/).
 
-### Running with Datastore emulator
-
-Install the [Google Cloud Datastore Emulator](https://cloud.google.com/datastore/docs/tools/datastore-emulator). 
-
-Start the Datastore emulator:
-
-```shell script
-gcloud beta emulators datastore start
-```
-
-In a separate process, run the server with the `run-datastore` target:
-
-```shell script
-make run-datastore
-```
-
 ### Configuration options
 
 The following environment variables can be used to configure the API. Default values are shown below:
@@ -55,7 +39,4 @@ FLOW_SESSIONCOOKIESSAMESITENONE=false
 
 FLOW_LEDGERCACHESIZE=128
 FLOW_STORAGEBACKEND="memory"
-
-FLOW_DATASTORE_GCPPROJECTID
-FLOW_DATASTORE_TIMEOUT="5s"
-```
+```