Update loofah to mitigate CVE-2018-8048

See flavorjones/loofah#144

Author: pixeltrix

Gemfile.lock

@@ -204,15 +204,15 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
-    loofah (2.1.1)
+    loofah (2.2.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.0)
       mini_mime (>= 0.1.1)
     metaclass (0.0.4)
     method_source (0.9.0)
     mini_mime (0.1.3)
-    mini_portile2 (2.2.0)
+    mini_portile2 (2.3.0)
     minitest (5.3.3)
     mocha (0.14.0)
       metaclass (~> 0.0.1)
@@ -225,12 +225,12 @@ GEM
     mysql2 (0.4.8-x64-mingw32)
     mysql2 (0.4.8-x86-mingw32)
     nio4r (2.2.0)
-    nokogiri (1.8.0)
-      mini_portile2 (~> 2.2.0)
-    nokogiri (1.8.0-x64-mingw32)
-      mini_portile2 (~> 2.2.0)
-    nokogiri (1.8.0-x86-mingw32)
-      mini_portile2 (~> 2.2.0)
+    nokogiri (1.8.2)
+      mini_portile2 (~> 2.3.0)
+    nokogiri (1.8.2-x64-mingw32)
+      mini_portile2 (~> 2.3.0)
+    nokogiri (1.8.2-x86-mingw32)
+      mini_portile2 (~> 2.3.0)
     parallel (1.12.0)
     parser (2.4.0.0)
       ast (~> 2.2)