README.md: correct provider organization & missing repository name

Author: katbyte

README.md

@@ -16,17 +16,17 @@ Requirements
 Building The Provider
 ---------------------
 
-Clone repository to: `$GOPATH/src/github.com/terraform-providers/terraform-provider-$PROVIDER_NAME`
+Clone repository to: `$GOPATH/src/github.com/terraform-providers/terraform-provider-gitlab`
 
 ```sh
 $ mkdir -p $GOPATH/src/github.com/terraform-providers; cd $GOPATH/src/github.com/terraform-providers
-$ git clone [email protected]:terraform-providers/terraform-provider-$PROVIDER_NAME
+$ git clone [email protected]:terraform-providers/terraform-provider-gitlab
 ```
 
 Enter the provider directory and build the provider
 
 ```sh
-$ cd $GOPATH/src/github.com/terraform-providers/terraform-provider-$PROVIDER_NAME
+$ cd $GOPATH/src/github.com/terraform-providers/terraform-provider-gitlab
 $ make build
 ```
 
@@ -44,7 +44,7 @@ To compile the provider, run `make build`. This will build the provider and put
 ```sh
 $ make bin
 ...
-$ $GOPATH/bin/terraform-provider-$PROVIDER_NAME
+$ $GOPATH/bin/terraform-provider-gitlab
 ...
 ```