Update react-scripts to latest version

package.json

@@ -6,7 +6,7 @@
   "devDependencies": {
     "enzyme": "^3.0.0",
     "gh-pages": "^0.12.0",
-    "react-scripts": "1.0.14",
+    "react-scripts": "3.2.0",
     "react-test-renderer": "^15.0.0",
     "sw-precache": "^5.2.0"
   },
@@ -22,5 +22,17 @@
     "test": "react-scripts test --env=jsdom",
     "eject": "react-scripts eject",
     "deploy": "npm run build&&gh-pages -b master -d build"
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
   }
 }

src/components/SocialShare/Facebook.jsx

@@ -4,7 +4,7 @@ import { Icon, IconPaths } from './icons.js';
 const facebookLink = "https://www.facebook.com/sharer/sharer.php?u=https://roshanjossey.github.io/first-contributions&quote=Yay%21%20I%20just%20made%20my%20first%20open%20source%20contribution%20with%20First%20Contributions.%20You%20can%20too,%20by%20following%20a%20simple%20tutorial%20at%20https%3A//goo.gl/66Axwe&hashtag=%23Hacktoberfest"
 
 const FacebookCard = () => (
-    <a className="icon-card twitter" href={facebookLink} target="_blank">
+    <a className="icon-card twitter" href={facebookLink} rel="noopener noreferrer" target="_blank">
         <Icon
             color="rgb(255, 255, 255)"
             size={40}

src/components/SocialShare/Linkedin.jsx

@@ -4,7 +4,7 @@ import { Icon, IconPaths } from './icons.js';
 const LinkedinLink = "https://www.linkedin.com/shareArticle?mini=true&url=https://goo.gl/66Axwe&title=First%20Contributions%20&summary=A%20project%20to%20help%20beginners%20get%20started%20with%20contributing%20to%20open%20source&source=https://roshanjossey.github.io"
 
 const LinkedinCard = () => (
-    <a className="icon-card linkedin" href={LinkedinLink} target="_blank">
+    <a className="icon-card linkedin" href={LinkedinLink} rel="noopener noreferrer" target="_blank">
         <Icon
             color="rgb(255, 255, 255)"
             size={50}

src/components/SocialShare/Twitter.jsx

@@ -4,7 +4,7 @@ import { Icon, IconPaths } from './icons.js';
 const twitterLink = "https://twitter.com/intent/tweet?text=Yay%21%20I%20just%20made%20my%20first%20open%20source%20contribution%20with%20@1stcontribution.%20You%20can%20too%20at%20https%3A//goo.gl/66Axwe%0A&hashtags=OpenSource,CodeNewbie,Hacktoberfest"
 
 const TwitterCard = () => (
-    <a className="icon-card twitter" href={twitterLink} target="_blank">
+    <a className="icon-card twitter" href={twitterLink} rel="noopener noreferrer" target="_blank">
         <Icon
             color="rgb(255, 255, 255)"
             size={40}