Docs: add hint for supported Node.js version (#777)

Author: JPeer264

.github/issue_template.md

@@ -1,5 +1,6 @@
 <!-- First ensure you installed the latest version of fs-extra -->
 <!-- If your bug still exists please fill out the following information if it applies to your issue: -->
 - **Operating System:**
+<!-- Please check if you have installed a supported version of Node.js as written in "engines" in the package.json -->
 - **Node.js version:**
 - **`fs-extra` version:**