downgrade node deps to >= 10

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@blockworks-foundation/mango-client",
-  "version": "0.1.5",
+  "version": "0.1.6",
   "description": "Library for interacting with Mango Markets' solana smart contracts.",
   "repository": "blockworks-foundation/mango-client-ts",
   "author": {
@@ -13,7 +13,7 @@
   "types": "lib/index.d.ts",
   "license": "MIT",
   "engines": {
-    "node": ">=12"
+    "node": ">=10"
   },
   "scripts": {
     "build": "tsc",
@@ -28,7 +28,7 @@
     "test:watch": "jest --watch"
   },
   "devDependencies": {
-    "@tsconfig/node14": "^1.0.0",
+    "@tsconfig/node10": "^1.0.0",
     "@types/bn.js": "^4.11.6",
     "@types/chai": "^4.2.14",
     "@types/jest": "^26.0.9",
@@ -58,12 +58,10 @@
     "@project-serum/serum": "^0.13.20",
     "@project-serum/sol-wallet-adapter": "^0.1.4",
     "@solana/spl-token": "0.0.13",
-
     "@solana/web3.js": "^0.90.0",
     "bn.js": "^5.1.2",
-    "buffer-layout": "^1.2.0",
-    "borsh": "https://github.com/defactojob/borsh-js#field-mapper"
-
+    "borsh": "https://github.com/defactojob/borsh-js#field-mapper",
+    "buffer-layout": "^1.2.0"
   },
   "browserslist": [
     ">0.2%",

tsconfig.json

@@ -1,5 +1,5 @@
 {
-  "extends": "@tsconfig/node14/tsconfig.json",
+  "extends": "@tsconfig/node10/tsconfig.json",
 
   "compilerOptions": {
     "outDir": "./lib",

yarn.lock

@@ -665,10 +665,10 @@
     tweetnacl "^1.0.0"
     ws "^7.0.0"
 
-"@tsconfig/node14@^1.0.0":
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/@tsconfig/node14/-/node14-1.0.0.tgz#5bd046e508b1ee90bc091766758838741fdefd6e"
-  integrity sha512-RKkL8eTdPv6t5EHgFKIVQgsDapugbuOptNd9OOunN/HAkzmmTnZELx1kNCK0rSdUYGmiFMM3rRQMAWiyp023LQ==
+"@tsconfig/node10@^1.0.0":
+  version "1.0.7"
+  resolved "https://registry.yarnpkg.com/@tsconfig/node10/-/node10-1.0.7.tgz#1eb1de36c73478a2479cc661ef5af1c16d86d606"
+  integrity sha512-aBvUmXLQbayM4w3A8TrjwrXs4DZ8iduJnuJLLRGdkWlyakCf1q6uHZJBzXoRA/huAEknG5tcUyQxN3A+In5euQ==
 
 "@types/babel__core@^7.0.0", "@types/babel__core@^7.1.7":
   version "7.1.12"