Move @types/big.js to dependencies & bump version

Author: xxczaki

package.json

@@ -1,6 +1,6 @@
 {
     "name": "cashify",
-    "version": "3.0.0",
+    "version": "3.0.1",
     "description": "Lightweight currency conversion library, successor of money.js",
     "main": "dist/index.js",
     "type": "module",
@@ -49,7 +49,6 @@
     ],
     "devDependencies": {
         "@sindresorhus/tsconfig": "^2.0.0",
-        "@types/big.js": "^6.1.2",
         "@types/node": "^16.11.6",
         "ava": "^3.15.0",
         "big.js": "^6.1.1",
@@ -77,7 +76,9 @@
             "@typescript-eslint/naming-convention": "off"
         }
     },
-    "dependencies": {},
+    "dependencies": {
+        "@types/big.js": "^6.1.2"
+    },
     "peerDependencies": {
         "big.js": ">=6.1.1"
     },