Remove unnecessary cross-env dependency

Author: wojtekmaj

package.json

@@ -8,8 +8,8 @@
   "sideEffects": false,
   "scripts": {
     "build": "yarn build-esm && yarn build-umd",
-    "build-esm": "cross-env BABEL_ENV=production-esm babel src -d dist/esm --ignore \"**/*.spec.js\"",
-    "build-umd": "cross-env BABEL_ENV=production-umd babel src -d dist/umd --ignore \"**/*.spec.js\"",
+    "build-esm": "BABEL_ENV=production-esm babel src -d dist/esm --ignore \"**/*.spec.js\"",
+    "build-umd": "BABEL_ENV=production-umd babel src -d dist/umd --ignore \"**/*.spec.js\"",
     "clean": "rimraf dist",
     "jest": "jest",
     "jest-coverage": "jest --coverage",
@@ -36,7 +36,6 @@
     "@babel/core": "^7.9.0",
     "@babel/plugin-transform-runtime": "^7.9.0",
     "@babel/preset-env": "^7.9.0",
-    "cross-env": "^7.0.0",
     "eslint": "^7.12.0",
     "eslint-config-wojtekmaj": "^0.5.0",
     "jest": "^26.0.0",

yarn.lock

@@ -1509,7 +1509,6 @@ __metadata:
     "@babel/plugin-transform-runtime": ^7.9.0
     "@babel/preset-env": ^7.9.0
     "@babel/runtime": ^7.9.0
-    cross-env: ^7.0.0
     eslint: ^7.12.0
     eslint-config-wojtekmaj: ^0.5.0
     jest: ^26.0.0
@@ -2362,18 +2361,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"cross-env@npm:^7.0.0":
-  version: 7.0.2
-  resolution: "cross-env@npm:7.0.2"
-  dependencies:
-    cross-spawn: ^7.0.1
-  bin:
-    cross-env: src/bin/cross-env.js
-    cross-env-shell: src/bin/cross-env-shell.js
-  checksum: 624d638db3b4b6b221f32238aeb6785b865365bf41154f01d46a23b6d78f807ca5588a3b32e9af5f17384b866fed3752d0e3ecf8c4a8cfca2935d363d27ba058
-  languageName: node
-  linkType: hard
-
 "cross-spawn@npm:^6.0.0":
   version: 6.0.5
   resolution: "cross-spawn@npm:6.0.5"
@@ -2387,7 +2374,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"cross-spawn@npm:^7.0.0, cross-spawn@npm:^7.0.1, cross-spawn@npm:^7.0.2":
+"cross-spawn@npm:^7.0.0, cross-spawn@npm:^7.0.2":
   version: 7.0.3
   resolution: "cross-spawn@npm:7.0.3"
   dependencies: