Making GitHub and CC license links open in new window

src/components/Footer/__snapshots__/test.js.snap

@@ -20,7 +20,8 @@ exports[`Footer rendering 1`] = `
         Generated images licensed: 
         <a
           href="http://creativecommons.org/licenses/by/3.0/"
-          rel="license"
+          rel="license external noopener noreferrer"
+          target="_blank"
         >
           <img
             alt="Creative Commons CC-BY-3.0 License"

src/components/Footer/index.js

@@ -11,7 +11,7 @@ const Footer = () => (
       </li>
       <li>
         <Trans i18nKey="Generated images licensed">
-          Generated images licensed: <a rel="license" href="http://creativecommons.org/licenses/by/3.0/">
+          Generated images licensed: <a rel="license external noopener noreferrer" target="_blank" href="http://creativecommons.org/licenses/by/3.0/">
             <img
               alt="Creative Commons CC-BY-3.0 License"
               src="https://licensebuttons.net/l/by/3.0/80x15.png" />

src/components/Header/__snapshots__/test.js.snap

@@ -16,6 +16,8 @@ exports[`Header rendering 1`] = `
     <li>
       <a
         href="https://github.com/javallone/regexper-static"
+        rel="external noopener noreferrer"
+        target="_blank"
       >
         <SvgMock />
         <Trans>

src/components/Header/index.js

@@ -11,7 +11,7 @@ const Header = () => (
     </h1>
 
     <ul>
-      <li><a href="https://github.com/javallone/regexper-static">
+      <li><a href="https://github.com/javallone/regexper-static" rel="external noopener noreferrer" target="_blank">
         <GithubIcon/><Trans>Source on GitHub</Trans>
       </a></li>
     </ul>