chore: include node typings

SvetoslavTsenov · SvetoslavTsenov · commit d89859d0b2b9 · 2019-02-23T11:48:21.000+02:00
diff --git a/postinstall.js b/postinstall.js
@@ -254,6 +254,7 @@ const run = async () => {
                 case mocha:
                     tsConfigJson.compilerOptions.types.push("mocha");
                     tsConfigJson.compilerOptions.types.push("chai");
+                    tsConfigJson.compilerOptions.types.push("node");
                     break;
                 default:
                     break;
