Updating gem packages following GH security alerts

Gemfile.lock

@@ -8,8 +8,8 @@ GEM
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
-    eventmachine (1.2.5)
-    ffi (1.9.23)
+    eventmachine (1.2.7)
+    ffi (1.9.25)
     fontcustom (2.0.0)
       json (~> 1.4)
       listen (>= 1.0, < 4.0)
@@ -18,7 +18,7 @@ GEM
     http_parser.rb (0.6.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.7.3)
+    jekyll (3.8.4)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
@@ -36,7 +36,7 @@ GEM
     jekyll-watch (2.0.0)
       listen (~> 3.0)
     json (1.8.6)
-    kramdown (1.16.2)
+    kramdown (1.17.0)
     libv8 (3.16.14.19)
     liquid (4.0.0)
     listen (3.1.5)
@@ -46,15 +46,15 @@ GEM
     mercenary (0.3.6)
     pathutil (0.16.1)
       forwardable-extended (~> 2.6)
-    public_suffix (3.0.2)
+    public_suffix (3.0.3)
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
     ref (2.0.0)
-    rouge (3.1.1)
+    rouge (3.2.1)
     ruby_dep (1.5.0)
     safe_yaml (1.0.4)
-    sass (3.5.6)
+    sass (3.6.0)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)