Merge pull request #543 from ishan16696/doc/fixFileMode

Documentation: standardised examples in README.md to use file mode:0600

README.md

@@ -101,7 +101,7 @@ To use bbolt as an embedded key-value store, import as:
 ```go
 import bolt "go.etcd.io/bbolt"
 
-db, err := bolt.Open(path, 0666, nil)
+db, err := bolt.Open(path, 0600, nil)
 if err != nil {
   return err
 }
@@ -664,7 +664,7 @@ uses a shared lock to allow multiple processes to read from the database but
 it will block any processes from opening the database in read-write mode.
 
 ```go
-db, err := bolt.Open("my.db", 0666, &bolt.Options{ReadOnly: true})
+db, err := bolt.Open("my.db", 0600, &bolt.Options{ReadOnly: true})
 if err != nil {
 	log.Fatal(err)
 }

db.go

@@ -164,9 +164,10 @@ func (db *DB) String() string {
 	return fmt.Sprintf("DB<%q>", db.path)
 }
 
-// Open creates and opens a database at the given path.
-// If the file does not exist then it will be created automatically.
+// Open creates and opens a database at the given path with a given file mode.
+// If the file does not exist then it will be created automatically with a given file mode.
 // Passing in nil options will cause Bolt to open the database with the default options.
+// Note: For read/write transactions, ensure the owner has write permission on the created/opened database file, e.g. 0600
 func Open(path string, mode os.FileMode, options *Options) (*DB, error) {
 	db := &DB{
 		opened: true,