Merge pull request #832 from alphagov/dependabot/bundler/dalli-2.7.7

Bump dalli from 2.7.6 to 2.7.7

Author: cbaines

Gemfile.lock

@@ -79,7 +79,7 @@ GEM
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
     crass (1.0.3)
-    dalli (2.7.6)
+    dalli (2.7.7)
     debug_inspector (0.0.3)
     domain_name (0.5.20170404)
       unf (>= 0.0.5, < 1.0.0)