fix(client): apply type errors from code review

Co-Authored-By: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

client/src/client-only-routes/ShowCertification.js

@@ -24,7 +24,7 @@ const propTypes = {
     name: PropTypes.string,
     certName: PropTypes.string,
     certTitle: PropTypes.string,
-    completionTime: PropTypes.string,
+    completionTime: PropTypes.number,
     date: PropTypes.string
   }),
   certDashedName: PropTypes.string,

client/src/components/profile/Profile.js

@@ -26,7 +26,10 @@ const propTypes = {
       showTimeLine: PropTypes.bool
     }),
     calendar: PropTypes.object,
-    streak: PropTypes.shape,
+    streak: PropTypes.shape({
+      current: PropTypes.number,
+      longest: PropTypes.number
+    }),
     completedChallenges: PropTypes.array,
     portfolio: PropTypes.array,
     about: PropTypes.string,