Update nokogiri to 1.8.5

- Clean up .snyk file

Author: tcdowney

.snyk

@@ -2,32 +2,8 @@
 version: v1.12.0
 # ignores vulnerabilities until expiry date; change duration by modifying expiry date
 ignore:
-  SNYK-RUBY-RUBYZIP-22039:
-    - '*':
-        reason: None Given
-        expires: 2018-10-04T22:06:09.286Z
   SNYK-RUBY-NOKOGIRI-20299:
     - '*':
-        reason: None Given
-        expires: 2018-11-03T22:58:21.603Z
-  SNYK-RUBY-ERUBIS-20482:
-    - '*':
-        reason: None Given
-        expires: 2018-10-04T22:25:04.050Z
-  SNYK-RUBY-RAILTIES-20454:
-    - '*':
-        reason: None Given
-        expires: 2018-10-04T22:25:17.771Z
-  SNYK-RUBY-SINATRA-22027:
-    - '*':
-        reason: None Given
-        expires: 2018-10-04T22:25:27.201Z
-  SNYK-RUBY-SINATRA-20488:
-    - '*':
-        reason: None Given
-        expires: 2018-10-04T22:25:53.799Z
-  SNYK-RUBY-RACKPROTECTION-20394:
-    - '*':
-        reason: None Given
-        expires: 2018-10-04T22:26:10.440Z
+        reason: This does not apply since we do not opt out of the `NONET` option in Nokogiri
+        expires: 2019-11-03T22:58:21.603Z
 patch: {}

Gemfile.lock

@@ -277,7 +277,7 @@ GEM
     net-ssh (5.0.2)
     netaddr (2.0.3)
     newrelic_rpm (5.3.0.346)
-    nokogiri (1.8.4)
+    nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
     os (0.9.6)
     palm_civet (1.1.0)