fix(package): update react-syntax-highlighter to version 12.0.1

Closes #115

Author: greenkeeper[bot]

package.json

@@ -7,7 +7,7 @@
     "react-dom": "^16.9.0",
     "react-redux": "7.1.3",
     "react-router-dom": "5.1.0",
-    "react-syntax-highlighter": "^10.3.5",
+    "react-syntax-highlighter": "^12.0.1",
     "redux": "4.0.1",
     "styled-components": "^4.3.1",
     "uuid": "3.3.3"