Fix README after 612b86e (TraceMachina#1132)

Author: aaronmondal

README.md

@@ -49,7 +49,8 @@ curl -O \
 docker run \
     -v $(pwd)/basic_cas.json:/config \
     -p 50051 \
-    ghcr.io/tracemachina/nativelink:v0.4.0
+    ghcr.io/tracemachina/nativelink:v0.4.0 \
+    config
 ```
 
 **Windows x86_64**
@@ -65,7 +66,8 @@ Invoke-WebRequest `
 docker run `
     -v ${PWD}/basic_cas.json:/config `
     -p 50051 `
-    ghcr.io/tracemachina/nativelink:v0.4.0
+    ghcr.io/tracemachina/nativelink:v0.4.0 `
+    config
 ```
 
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