oracledb.d.ts: fix IMetaData to match real data structure.

oracledb/oracledb-tests.ts

@@ -24,6 +24,7 @@ OracleDB.getConnection(
 				}
 				console.log(result.rows);
                 console.log(result.rows[0].department_id); // when outFormet is OBJECT
+                console.log(result.metaData[0].name);
 			}
 		);
 	}

oracledb/oracledb.d.ts

@@ -100,7 +100,7 @@ declare module 'oracledb' {
 
 	export interface IMetaData {
 		/** Column name */
-		columnName: string;
+		name: string;
 	}
 
 	export interface IResultSet {