Gem: Update nokogiri to v1.10.4

Fixes security issue: https://nvd.nist.gov/vuln/detail/CVE-2019-5477

Gemfile

@@ -41,7 +41,7 @@ gem 'devise', '~> 4.4'
 # Use CanCanCan for authorization (permission management)
 gem 'cancancan', '~> 2.1'
 # Nokogiri for parsing fields with errors
-gem 'nokogiri', '~> 1.8.1'
+gem 'nokogiri', '~> 1.10'
 # For simplified Rails configuration
 gem 'config', '~> 1.7'
 # Sequenced for scoped IDs

Gemfile.lock

@@ -312,7 +312,7 @@ GEM
     mime-types-data (3.2018.0812)
     mimemagic (0.3.2)
     mini_mime (1.0.1)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.4.0)
     minitest (5.11.3)
     momentjs-rails (2.20.1)
       railties (>= 3.1)
@@ -324,8 +324,8 @@ GEM
     net-ssh (5.0.2)
     netrc (0.11.0)
     nio4r (2.3.1)
-    nokogiri (1.8.5)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.10.4)
+      mini_portile2 (~> 2.4.0)
     notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -564,7 +564,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   lograge (~> 0.10)
   materialize-sass (~> 1.0.0beta)
-  nokogiri (~> 1.8.1)
+  nokogiri (~> 1.10)
   paperclip (~> 6.0)
   pg (~> 1.1)
   premailer-rails (~> 1.10)