Update gems with security vulnerabilities

ruby-advisory-db: 323 advisories
Name: nokogiri
Version: 1.8.4
Advisory: CVE-2018-14404
Criticality: Unknown
URL: sparklemotion/nokogiri#1785
Title: Nokogiri gem, via libxml2, is affected by multiple vulnerabilities
Solution: upgrade to >= 1.8.5

Name: rubyzip
Version: 1.2.1
Advisory: CVE-2018-1000544
Criticality: Unknown
URL: rubyzip/rubyzip#369
Title: Directory Traversal in rubyzip
Solution: upgrade to >= 1.2.2

Gemfile.lock

@@ -152,7 +152,7 @@ GEM
       activesupport (>= 4.2.0)
     hashdiff (0.3.7)
     highline (1.7.8)
-    i18n (1.0.1)
+    i18n (1.1.0)
       concurrent-ruby (~> 1.0)
     i18n-tasks (0.9.5)
       activesupport (>= 4.0.2)
@@ -181,7 +181,7 @@ GEM
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
-    mini_mime (1.0.0)
+    mini_mime (1.0.1)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
     multipart-post (2.0.0)
@@ -192,7 +192,7 @@ GEM
       net-ssh (>= 2.6.5)
     net-ssh (4.1.0)
     nio4r (2.3.1)
-    nokogiri (1.8.3)
+    nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
     normalize-rails (3.0.3)
     oj (2.18.5)
@@ -259,7 +259,7 @@ GEM
       rspec-mocks (~> 3.5.0)
       rspec-support (~> 3.5.0)
     rspec-support (3.5.0)
-    rubyzip (1.2.1)
+    rubyzip (1.2.2)
     safe_yaml (1.0.4)
     sass (3.4.22)
     sass-rails (5.0.6)
@@ -396,4 +396,4 @@ RUBY VERSION
    ruby 2.5.1p57
 
 BUNDLED WITH
-   1.16.2
+   1.16.5