Bump dalli from 2.7.7 to 2.7.8 (#202)

Bumps [dalli](https://github.com/petergoldstein/dalli) from 2.7.7 to 2.7.8.
- [Release notes](https://github.com/petergoldstein/dalli/releases)
- [Changelog](https://github.com/petergoldstein/dalli/blob/master/History.md)
- [Commits](petergoldstein/dalli@v2.7.7...v2.7.8)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile

@@ -35,7 +35,7 @@ gem 'redcarpet', '~> 3.4.0' # A fast, safe and extensible Markdown to (X)HTML pa
 gem 'opbeat', '~> 3.0.9' # performance monitoring
 gem 'skylight', '~> 1.6.0' # Skylight is a smart profiler for Rails apps
 gem 'kaminari', '~> 1.1.1' # sophisticated paginator for Rails
-gem 'dalli', '~> 2.7.7' # High performance memcached client for Ruby
+gem 'dalli', '~> 2.7.8' # High performance memcached client for Ruby
 gem 'actionpack-action_caching', '~> 1.2.0' # Action caching for Action Pack
 gem 'rails-observers', '~> 0.1.5' # Rails observer
 # See https://github.com/rails/execjs#readme for more supported runtimes

Gemfile.lock

@@ -104,7 +104,7 @@ GEM
       cucumber
       timecop
     cucumber-wire (0.0.1)
-    dalli (2.7.7)
+    dalli (2.7.8)
     database_cleaner (1.6.2)
     debug_inspector (0.0.3)
     diff-lcs (1.3)
@@ -345,7 +345,7 @@ DEPENDENCIES
   coveralls (~> 0.8.15)
   cucumber-rails (~> 1.5.0)
   cucumber-timecop (~> 0.0.6)
-  dalli (~> 2.7.7)
+  dalli (~> 2.7.8)
   database_cleaner (~> 1.6.2)
   dynamic_sitemaps (~> 2.0.0)
   ffaker (~> 2.9.0)