Bump N-API version to 4

Author: cjbj

CHANGELOG.md

@@ -8,7 +8,7 @@
   [N-API](https://nodejs.org/api/n-api.html) in place of
   [NAN](https://github.com/nodejs/nan).
     - Node-oracledb 4 requires Node.js 8.16 or Node.js 10.16, or higher.  Node.js 8.16, 10.16, 11.12 and 12 contain an important N-API performance fix.
-    - N-API allows node-oracledb binaries to be portable between Node.js versions on a given operating system, subject to N-API compatibility.  Node-oracledb uses N-API version 2.
+    - N-API allows node-oracledb binaries to be portable between Node.js versions on a given operating system, subject to N-API compatibility.  Node-oracledb uses N-API version 4.
     - Oracle Client libraries are still required at runtime.  These can be from Oracle Instant Client, the full Oracle Client, or an Oracle Database installation.
     - The string representation of classes has changed to `[Object Object]` as a consequence of using N-API.  Use `Object.getPrototypeOf()` to get class information.
     - The C compiler required for building from source code no longer needs C++11 compatibility.  The node-oracledb source code is now pure C.

INSTALL.md

@@ -71,7 +71,7 @@ guaranteed to be available or usable in your environment.
 
 #### <a name="mig40"></a> 1.1 Installation Changes in node-oracledb version 4.0
 
-Node-oracledb 4.0 was refactored to use [N-API][53] version 2.  On
+Node-oracledb 4.0 was refactored to use [N-API][53] version 4.  On
 each operating system, a node-oracledb binary will work with a number
 of Node.js versions from Node.js 8.16 and Node.js 10.16 onward,
 dependent on N-API compatibility.  This means that when upgrading

src/njsModule.h

@@ -26,7 +26,7 @@
 #ifndef __NJSMODULE_H__
 #define __NJSMODULE_H__
 
-#define NAPI_VERSION 2
+#define NAPI_VERSION 4
 
 #include <node_api.h>
 #include <stdarg.h>