chore(deps): pin dependencies (#30)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

package.json

@@ -44,23 +44,23 @@
     }
   },
   "devDependencies": {
-    "@babel/cli": "^7.4.3",
-    "@babel/core": "^7.4.3",
-    "@babel/plugin-transform-spread": "^7.2.2",
-    "@babel/preset-env": "^7.4.3",
-    "@babel/preset-react": "^7.0.0",
-    "babel-jest": "^24.7.1",
-    "coveralls": "^3.0.3",
-    "enzyme": "^3.9.0",
-    "enzyme-adapter-react-16": "^1.12.1",
-    "enzyme-to-json": "^3.3.5",
-    "jest": "^24.7.1",
+    "@babel/cli": "7.4.3",
+    "@babel/core": "7.4.3",
+    "@babel/plugin-transform-spread": "7.2.2",
+    "@babel/preset-env": "7.4.3",
+    "@babel/preset-react": "7.0.0",
+    "babel-jest": "24.7.1",
+    "coveralls": "3.0.3",
+    "enzyme": "3.9.0",
+    "enzyme-adapter-react-16": "1.12.1",
+    "enzyme-to-json": "3.3.5",
+    "jest": "24.7.1",
     "next": "9.4.4",
-    "prettier": "^2.0.0",
-    "react": "^16.8.6",
-    "react-dom": "^16.8.6",
+    "prettier": "2.0.0",
+    "react": "16.8.6",
+    "react-dom": "16.8.6",
     "react-live": "2.2.2",
-    "react-test-renderer": "^16.8.6"
+    "react-test-renderer": "16.8.6"
   },
   "keywords": [
     "react",