Update nokogiri gem due to CVE-2019-11068

Name: nokogiri
Version: 1.10.2
Advisory: CVE-2019-11068
Criticality: Unknown
URL: sparklemotion/nokogiri#1892
Title: Nokogiri gem, via libxslt, is affected by improper access control vulnerability
Solution: upgrade to >= 1.10.3

Gemfile.lock

@@ -229,7 +229,7 @@ GEM
     multi_json (1.13.1)
     nenv (0.3.0)
     nio4r (2.3.1)
-    nokogiri (1.10.2)
+    nokogiri (1.10.3)
       mini_portile2 (~> 2.4.0)
     notiffany (0.1.1)
       nenv (~> 0.1)