v3.9.0: feat() upgrade to node lts, feat() upgrade axios, jest and other dependencies, chore(): move some dependencies to optional

test/tsconfig.test.json

@@ -0,0 +1,8 @@
+{
+  "extends": "../tsconfig.json",
+  "exclude": ["node_modules", "dist"],
+  "compilerOptions": {
+    "strictNullChecks": false
+  },
+  "include": ["test/**/*.ts"]
+}