Detect 16m color support on Windows >=10.0.14931 (#71)

index.js

@@ -50,14 +50,15 @@ function supportsColor(stream) {
  // libuv that enables 256 color output on Windows. Anything earlier and it
  // won't work. However, here we target Node.js 8 at minimum as it is an LTS
  // release, and Node.js 7 is not. Windows 10 build 10586 is the first Windows
- // release that supports 256 colors.
+ // release that supports 256 colors. Windows 10 build 14931 is the first release
+ // that supports 16m/TrueColor.
  const osRelease = os.release().split('.');
  if (
  Number(process.versions.node.split('.')[0]) >= 8 &&
  Number(osRelease[0]) >= 10 &&
  Number(osRelease[2]) >= 10586
  ) {
- return 2;
+ return Number(osRelease[2]) >= 14931 ? 3 : 2;
  }
 
  return 1;

test.js

@@ -295,3 +295,15 @@ test('return level 2 if on Windows 10 build 10586 or later and Node version is >
  const result = importFresh('.');
  t.is(result.stdout.level, 2);
 });
+
+test('return level 3 if on Windows 10 build 14931 or later and Node version is >= 8.0.0', t => {
+ Object.defineProperty(process, 'platform', {
+ value: 'win32'
+ });
+ Object.defineProperty(process.versions, 'node', {
+ value: '8.0.0'
+ });
+ os.release = () => '10.0.14931';
+ const result = importFresh('.');
+ t.is(result.stdout.level, 3);
+});