add revoke doc and fix messages (#44)

README.md

@@ -12,8 +12,8 @@ Currently supports;
 
 - list the user's permissions for each BigQuery Datasets
 - permit users to each BigQuery Datasets access role (READER/WRITER/OWNER) and `roles/bigquery.jobUser` (to run query)
-- permit users to Project-wide access role (`roles/viewer` or `rolse/editor`) 
-
+- permit users to Project-wide access role (`roles/viewer` or `rolse/editor`)
+- revoke users' datasets and/or project-wide permissions
 
 ## Requirement
 
@@ -71,6 +71,17 @@ Permit user2@email.com to bq-project-id access as READER
 
 ```
 
+Revoke the user(s)' access permissions.
+```bash
+$ bqiam revoke dataset READER -p bq-project-id -u user1@email.com -d dataset1
+Revoked user1@email.com's permission of dataset1 access as READER
+
+$ bqiam project READER -p bq-project-id -u user1@email.com -u user2@email.com
+Revoked user1@email.com's permission of bq-project-id access as READER
+Revoked user2@email.com's permission of bq-project-id access as READER
+```
+
+
 ## Completion
 Completion is available for bash or zsh.
 Download projects, datasets, users list data via GCP API.

bqrole/dataset.go

@@ -128,7 +128,7 @@ func RevokeDataset(role bq.AccessRole, project string, users, datasets []string,
 					return err
 				}
 			}
-			fmt.Printf("Revoke %s to %s access as %s\n", user, dataset, role)
+			fmt.Printf("Revoked %s's permission of %s access as %s\n", user, dataset, role)
 		}
 	}
 

bqrole/project.go

@@ -102,7 +102,7 @@ func RevokeProject(role, project string, users []string, yes bool) error {
 		if err != nil {
 			return err
 		}
-		fmt.Printf("Revoke %s to %s access as %s\n", user, project, role)
+		fmt.Printf("Revoked %s's permission of %s access as %s\n", user, project, role)
 	}
 
 	return nil