update nokogiri to 1.10.9

Gemfile

@@ -142,7 +142,7 @@ gem "leaflet-rails",       "1.5.1"
 
 # Parsing
 
-gem "nokogiri",          "1.10.8"
+gem "nokogiri",          "1.10.9"
 gem "open_graph_reader", "0.7.0" # also update User-Agent in features/support/webmock.rb
 gem "redcarpet",         "3.4.0"
 gem "ruby-oembed",       "0.12.0"

Gemfile.lock

@@ -415,7 +415,7 @@ GEM
     naught (1.1.0)
     nenv (0.3.0)
     nio4r (2.5.2)
-    nokogiri (1.10.8)
+    nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
     notiffany (0.1.3)
       nenv (~> 0.1)
@@ -846,7 +846,7 @@ DEPENDENCIES
   minitest
   mobile-fu (= 1.4.0)
   mysql2 (= 0.5.2)
-  nokogiri (= 1.10.8)
+  nokogiri (= 1.10.9)
   omniauth (= 1.9.0)
   omniauth-tumblr (= 1.2)
   omniauth-twitter (= 1.4.0)