Fix: Forward TSNeverKeyword (fixes eslint#380)

Author: azz

lib/ast-node-types.js

@@ -124,6 +124,7 @@ module.exports = {
     TSModuleDeclaration: "TSModuleDeclaration",
     TSNamespaceFunctionDeclaration: "TSNamespaceFunctionDeclaration",
     TSNonNullExpression: "TSNonNullExpression",
+    TSNeverKeyword: "TSNeverKeyword",
     TSNullKeyword: "TSNullKeyword",
     TSNumberKeyword: "TSNumberKeyword",
     TSObjectKeyword: "TSObjectKeyword",

tests/fixtures/typescript/basics/never-type-param.src.ts

@@ -0,0 +1,2 @@
+const x: X<never>;
+Observable.empty<never>();