fix(package): update prismjs to version 1.17.1

Closes #1170

Author: greenkeeper[bot]

package.json

@@ -55,7 +55,7 @@
     "parse": "2.4.0",
     "passport": "0.4.0",
     "passport-local": "1.0.0",
-    "prismjs": "1.16.0",
+    "prismjs": "1.17.1",
     "prop-types": "15.7.2",
     "query-string": "6.5.0",
     "react": "16.8.6",