Update loofah to mitigate CVE-2018-8048

See flavorjones/loofah#144

Author: pixeltrix

Gemfile.lock

@@ -159,7 +159,7 @@ GEM
     logstash-event (1.2.02)
     logstash-logger (0.25.1)
       logstash-event (~> 1.2)
-    loofah (2.1.1)
+    loofah (2.2.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.0)
@@ -178,7 +178,7 @@ GEM
     multipart-post (2.0.0)
     net-http-persistent (3.0.0)
       connection_pool (~> 2.2)
-    nokogiri (1.8.1)
+    nokogiri (1.8.2)
       mini_portile2 (~> 2.3.0)
     paperclip (5.1.0)
       activemodel (>= 4.2.0)
@@ -228,10 +228,10 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rake (12.3.0)
-    redcarpet (3.4.0)
     rb-fsevent (0.10.2)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
+    redcarpet (3.4.0)
     request_store (1.3.2)
     rspec-core (3.7.0)
       rspec-support (~> 3.7.0)