set tsconfig lib and target to es6

Author: Heliozoa

bindings/tmc-langs-node/tsconfig.json

@@ -1,12 +1,15 @@
 {
-    "compilerOptions": {
-      "target": "ES2015",
-      "module": "commonjs",
-      "strict": true,
-      "esModuleInterop": true,
-      "skipLibCheck": true,
-      "forceConsistentCasingInFileNames": true
-    },
-    "$schema": "https://json.schemastore.org/tsconfig",
-    "display": "Recommended"
-  }
+  "compilerOptions": {
+    "lib": [
+      "es6"
+    ],
+    "target": "es6",
+    "module": "commonjs",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true
+  },
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "display": "Recommended"
+}