Update gems (#64)

Gemfile.lock

@@ -6,7 +6,7 @@ GEM
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
       tzinfo (~> 2.0)
-    addressable (2.8.3)
+    addressable (2.8.5)
       public_suffix (>= 2.0.2, < 6.0)
     coffee-script (2.4.1)
       coffee-script-source
@@ -15,8 +15,8 @@ GEM
     colorator (1.1.0)
     commonmarker (0.23.10)
     concurrent-ruby (1.2.2)
-    dnsruby (1.61.9)
-      simpleidn (~> 0.1)
+    dnsruby (1.70.0)
+      simpleidn (~> 0.2.1)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
@@ -25,7 +25,7 @@ GEM
     eventmachine (1.2.7)
     eventmachine (1.2.7-x64-mingw32)
     execjs (2.8.1)
-    faraday (2.7.4)
+    faraday (2.7.10)
       faraday-net_http (>= 2.0, < 3.1)
       ruby2_keywords (>= 0.0.4)
     faraday-net_http (3.0.2)
@@ -207,26 +207,28 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
-    mini_portile2 (2.8.1)
+    mini_portile2 (2.8.4)
     minima (2.5.1)
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
     minitest (5.19.0)
-    nokogiri (1.14.3)
-      mini_portile2 (~> 2.8.0)
+    nokogiri (1.15.4)
+      mini_portile2 (~> 2.8.2)
+      racc (~> 1.4)
+    nokogiri (1.15.4-x64-mingw32)
       racc (~> 1.4)
     octokit (4.25.1)
       faraday (>= 1, < 3)
       sawyer (~> 0.9)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.7)
-    racc (1.6.2)
+    racc (1.7.1)
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
+    rexml (3.2.6)
     rouge (3.26.0)
     ruby2_keywords (0.0.5)
     rubyzip (2.3.2)