Bump nokogiri from 1.6.7.2 to 1.9.1

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.6.7.2 to 1.9.1.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/master/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.6.7.2...v1.9.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -45,7 +45,7 @@ GEM
       tzinfo (~> 1.1)
     addressable (2.4.0)
     arel (6.0.3)
-    builder (3.2.2)
+    builder (3.2.3)
     capybara (2.6.2)
       addressable
       mime-types (>= 1.16)
@@ -67,6 +67,7 @@ GEM
     country_select (2.5.1)
       countries (~> 1.2.0)
       sort_alphabetical (~> 1.0)
+    crass (1.0.5)
     currencies (0.4.2)
     daemons (1.2.3)
     diff-lcs (1.2.5)
@@ -83,32 +84,34 @@ GEM
     hashr (2.0.0)
     http-cookie (1.0.2)
       domain_name (~> 0.5)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     i18n_data (0.7.0)
     jquery-rails (4.1.0)
       rails-dom-testing (~> 1.0)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (1.8.3)
+    json (1.8.6)
     kgio (2.10.0)
-    loofah (2.0.3)
+    loofah (2.3.1)
+      crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.6.3)
       mime-types (>= 1.16, < 3)
     mime-types (2.99)
-    mini_portile2 (2.0.0)
-    minitest (5.8.4)
+    mini_portile2 (2.4.0)
+    minitest (5.13.0)
     multi_json (1.11.2)
     netrc (0.11.0)
-    nokogiri (1.6.7.2)
-      mini_portile2 (~> 2.0.0.rc2)
+    nokogiri (1.9.1)
+      mini_portile2 (~> 2.4.0)
     pg (0.18.4)
     power_assert (0.2.7)
     protected_attributes (1.1.3)
       activemodel (>= 4.0.1, < 5.0)
     quiet_assets (1.1.0)
       railties (>= 3.1, < 5.0)
-    rack (1.6.4)
+    rack (1.6.11)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.5.1)
@@ -124,12 +127,12 @@ GEM
       sprockets-rails
     rails-deprecated_sanitizer (1.0.3)
       activesupport (>= 4.2.0.alpha)
-    rails-dom-testing (1.0.7)
-      activesupport (>= 4.2.0.beta, < 5.0)
-      nokogiri (~> 1.6.0)
+    rails-dom-testing (1.0.9)
+      activesupport (>= 4.2.0, < 5.0)
+      nokogiri (~> 1.6)
       rails-deprecated_sanitizer (>= 1.0.1)
-    rails-html-sanitizer (1.0.3)
-      loofah (~> 2.0)
+    rails-html-sanitizer (1.3.0)
+      loofah (~> 2.3)
     railties (4.2.5.1)
       actionpack (= 4.2.5.1)
       activesupport (= 4.2.5.1)
@@ -192,9 +195,9 @@ GEM
       eventmachine (~> 1.0, >= 1.0.4)
       rack (~> 1.0)
     thor (0.19.1)
-    thread_safe (0.3.5)
+    thread_safe (0.3.6)
     tilt (2.0.2)
-    tzinfo (1.2.2)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
     uglifier (2.7.2)
       execjs (>= 0.3.0)
@@ -207,7 +210,7 @@ GEM
       kgio (~> 2.6)
       rack
       raindrops (~> 0.7)
-    xpath (2.0.0)
+    xpath (2.1.0)
       nokogiri (~> 1.3)
 
 PLATFORMS