Update jekyll-redirect-from

This is a stepping stone to updating Jekyll & Kramdown.
There are no changes to the build ouptut from this update.

Author: PeterJCLaw

Gemfile.lock

@@ -29,8 +29,8 @@ GEM
       pathutil (~> 0.9)
       rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
-    jekyll-redirect-from (0.14.0)
-      jekyll (~> 3.3)
+    jekyll-redirect-from (0.16.0)
+      jekyll (>= 3.3, < 5.0)
     jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
     jekyll-watch (2.1.2)