chore(fix): unpins versions of devDependencies

package.json

@@ -32,35 +32,35 @@
     "react": "16.8.x"
   },
   "devDependencies": {
-    "@babel/core": "7.4.3",
-    "@babel/preset-env": "7.4.3",
-    "@babel/preset-react": "7.0.0",
-    "@storybook/addon-options": "4.1.16",
-    "@storybook/addons": "4.1.16",
-    "@storybook/react": "4.1.16",
-    "axios": "0.18.0",
-    "babel-eslint": "10.0.1",
-    "babel-loader": "8.0.5",
-    "eslint": "5.16.0",
-    "eslint-config-prettier": "4.1.0",
-    "eslint-config-react-app": "3.0.8",
-    "eslint-plugin-flowtype": "3.5.1",
-    "eslint-plugin-import": "2.16.0",
-    "eslint-plugin-jsx-a11y": "6.2.1",
-    "eslint-plugin-prettier": "3.0.1",
-    "eslint-plugin-react": "7.12.4",
-    "eslint-plugin-react-hooks": "1.6.0",
-    "husky": "1.3.1",
-    "jest": "24.7.1",
-    "jest-dom": "3.1.3",
-    "lint-staged": "8.1.5",
-    "nwb": "0.23.0",
-    "prettier": "1.16.4",
-    "react": "16.8.6",
-    "react-hooks-testing-library": "0.4.0",
-    "storybook-readme": "4.0.5",
-    "testcafe": "1.1.1",
-    "testcafe-browser-provider-browserstack": "1.8.0"
+    "@babel/core": "^7.4.3",
+    "@babel/preset-env": "^7.4.3",
+    "@babel/preset-react": "^7.0.0",
+    "@storybook/addon-options": "^4.1.16",
+    "@storybook/addons": "^4.1.16",
+    "@storybook/react": "^4.1.16",
+    "axios": "^0.18.0",
+    "babel-eslint": "^10.0.1",
+    "babel-loader": "^8.0.5",
+    "eslint": "^5.16.0",
+    "eslint-config-prettier": "^4.1.0",
+    "eslint-config-react-app": "^3.0.8",
+    "eslint-plugin-flowtype": "^3.5.1",
+    "eslint-plugin-import": "^2.16.0",
+    "eslint-plugin-jsx-a11y": "^6.2.1",
+    "eslint-plugin-prettier": "^3.0.1",
+    "eslint-plugin-react": "^7.12.4",
+    "eslint-plugin-react-hooks": "^1.6.0",
+    "husky": "^1.3.1",
+    "jest": "^24.7.1",
+    "jest-dom": "^3.1.3",
+    "lint-staged": "^8.1.5",
+    "nwb": "^0.23.0",
+    "prettier": "^1.16.4",
+    "react": "^16.8.6",
+    "react-hooks-testing-library": "^0.4.0",
+    "storybook-readme": "^4.0.5",
+    "testcafe": "^1.1.1",
+    "testcafe-browser-provider-browserstack": "^1.8.0"
   },
   "author": "NearForm",
   "homepage": "https://github.com/nearform/react-browser-hooks",