Merge pull request apache#794 from simplyianm/qocql-typo

Fix typo qocql -> gocql

session.go

@@ -1557,7 +1557,7 @@ var (
 	ErrTooManyStmts  = errors.New("too many statements")
 	ErrUseStmt       = errors.New("use statements aren't supported. Please see https://github.com/gocql/gocql for explaination.")
 	ErrSessionClosed = errors.New("session has been closed")
-	ErrNoConnections = errors.New("qocql: no hosts available in the pool")
+	ErrNoConnections = errors.New("gocql: no hosts available in the pool")
 	ErrNoKeyspace    = errors.New("no keyspace provided")
 	ErrNoMetadata    = errors.New("no metadata available")
 )