src: update NODE_MODULE_VERSION to 115

Major V8 updates are usually API/ABI incompatible with previous
versions. This commit adapts NODE_MODULE_VERSION for V8 11.0.

Refs: https://github.com/nodejs/CTC/blob/master/meetings/2016-09-28.md

Author: nodejs-github-bot

doc/abi_version_registry.json

@@ -1,5 +1,6 @@
 {
   "NODE_MODULE_VERSION": [
+    { "modules": 115, "runtime": "node", "variant": "v8_11.0", "versions": "20.0.0-pre" },
     { "modules": 114,"runtime": "electron", "variant": "electron",              "versions": "24" },
     { "modules": 113,"runtime": "electron", "variant": "electron",              "versions": "23" },
     { "modules": 112, "runtime": "node", "variant": "v8_10.9", "versions": "20.0.0-pre" },

src/node_version.h

@@ -89,7 +89,7 @@
  * version matching should open a pull request to reserve a number in this
  * registry.
  */
-#define NODE_MODULE_VERSION 112
+#define NODE_MODULE_VERSION 115
 
 // The NAPI_VERSION provided by this version of the runtime. This is the version
 // which the Node binary being built supports.