update gemfile / theme

Gemfile.lock

@@ -17,9 +17,7 @@ GEM
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     eventmachine (1.2.7)
-    eventmachine (1.2.7-x64-mingw32)
     ffi (1.12.2)
-    ffi (1.12.2-x64-mingw32)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
     i18n (1.8.2)
@@ -47,7 +45,7 @@ GEM
       sassc (> 2.0.1, < 3.0)
     jekyll-seo-tag (2.6.1)
       jekyll (>= 3.3, < 5.0)
-    jekyll-theme-lcsb-default (0.3.3)
+    jekyll-theme-lcsb-default (0.3.15)
       jekyll (~> 4.0)
       jekyll-seo-tag (~> 2.5)
     jekyll-watch (2.2.1)
@@ -66,7 +64,7 @@ GEM
       jekyll-seo-tag (~> 2.1)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (4.0.3)
+    public_suffix (4.0.4)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -74,19 +72,12 @@ GEM
     safe_yaml (1.0.5)
     sassc (2.2.1)
       ffi (~> 1.9)
-    sassc (2.2.1-x64-mingw32)
-      ffi (~> 1.9)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
-    tzinfo (2.0.1)
-      concurrent-ruby (~> 1.0)
-    tzinfo-data (1.2019.3)
-      tzinfo (>= 1.0.0)
-    unicode-display_width (1.6.1)
+    unicode-display_width (1.7.0)
 
 PLATFORMS
   ruby
-  x64-mingw32
 
 DEPENDENCIES
   bundler (> 2.0)