fixed issue with incorrect push command

README.md

@@ -19,6 +19,8 @@ Build the docker image with the following commands:
 ```
 export GO15VENDOREXPERIMENT=1
 GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -a -tags netgo
+
+docker build --rm=true -t plugins/docker .
 ```
 
 Please note incorrectly building the image for the correct x64 linux and with GCO disabled will result in an error when running the Docker image:
@@ -37,7 +39,7 @@ docker run --rm \
   -e PLUGIN_TAG=latest \
   -e PLUGIN_REPO=octocat/hello-world \
   -e DRONE_COMMIT_SHA=d8dbe4d94f15fe89232e0402c6e8a0ddf21af3ab \
-  -v $(pwd)/$(pwd) \
+  -v $(pwd):$(pwd) \
   -w $(pwd) \
   --privileged \
   plugins/docker --dry-run