Add node 12 support

Author: Flarna

.travis.yml

@@ -21,6 +21,7 @@ env:
   - TRAVIS_NODE_VERSION="9"
   - TRAVIS_NODE_VERSION="10"
   - TRAVIS_NODE_VERSION="11"
+  - TRAVIS_NODE_VERSION="12"
 matrix:
   exclude:
     - os: osx

README.md

@@ -1,7 +1,7 @@
 Native Abstractions for Node.js
 ===============================
 
-**A header file filled with macro and utility goodness for making add-on development for Node.js easier across versions 0.8, 0.10, 0.12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11.**
+**A header file filled with macro and utility goodness for making add-on development for Node.js easier across versions 0.8, 0.10, 0.12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12.**
 
 ***Current version: 2.13.2***
 

appveyor.yml

@@ -15,6 +15,7 @@ environment:
     - nodejs_version: "9"
     - nodejs_version: "10"
     - nodejs_version: "11"
+    - nodejs_version: "12"
 
 # Install scripts. (runs after repo cloning)
 install:

nan.h

@@ -38,6 +38,7 @@
 #define NODE_9_0_MODULE_VERSION  59
 #define NODE_10_0_MODULE_VERSION 64
 #define NODE_11_0_MODULE_VERSION 67
+#define NODE_12_0_MODULE_VERSION 72
 
 #ifdef _MSC_VER
 # define NAN_HAS_CPLUSPLUS_11 (_MSC_VER >= 1800)