Drop Node.js v18 (EoL) support

Author: cometkim

.nvmrc

@@ -1 +1 @@
-18
+20

CONTRIBUTING.md

@@ -14,7 +14,7 @@ Happy hacking!
 
 > Most of our contributors are working on Apple machines, so all our instructions are currently macOS / Linux centric. Contributions for Windows development welcome!
 
-- [NodeJS v18](https://nodejs.org/)
+- [Node.js](https://nodejs.org/) v20.x
 - C compiler toolchain (usually installed with `xcode` on Mac)
 - Python <= 3.11 (required to build ninja)
 - Rust toolchain (required to build rewatch; follow the instructions at https://www.rust-lang.org/tools/install)

package-lock.json

@@ -33,7 +33,7 @@
     "Woonki Moon (https://github.com/mununki)"
   ],
   "engines": {
-    "node": ">=18"
+    "node": ">=20"
   },
   "bin": {
     "bsc": "cli/bsc",
@@ -78,5 +78,5 @@
     "mocha": "10.8.2",
     "nyc": "15.0.0"
   },
-  "packageManager": "npm@10.8.1+sha512.0e9d42e92bd2318408ed81eaff2da5f78baf23ee7d12a6eed44a6e2901d0f29d7ab715d1b918ade601f72e769a824d9a5c322383f22bbbda5dd396e79de2a077"
+  "packageManager": "npm@10.9.2+sha512.8ab88f10f224a0c614cb717a7f7c30499014f77134120e9c1f0211ea3cf3397592cbe483feb38e0c4b3be1c54e347292c76a1b5edb94a3289d5448484ab8ac81"
 }