upgrade bootstrap

.gitignore

@@ -14,3 +14,4 @@ deploy-site
 /commits.sh
 /assets/css/
 /vendor/
+/package-lock.json

Gemfile

@@ -3,5 +3,4 @@ source 'https://rubygems.org' do
   gem 'jekyll-redirect-from'
   gem 'jekyll-toc'
   gem 'jekyll-random'
-  gem 'public_suffix', '3.0.0'
 end

Gemfile.lock

@@ -8,15 +8,15 @@ GEM
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
-    eventmachine (1.2.5)
-    ffi (1.9.21)
+    eventmachine (1.2.7)
+    ffi (1.9.25)
     forwardable-extended (2.6.0)
     htmlbeautifier (1.3.1)
     htmlcompressor (0.4.0)
     http_parser.rb (0.6.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.7.2)
+    jekyll (3.8.3)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
@@ -31,7 +31,7 @@ GEM
       safe_yaml (~> 1.0)
     jekyll-random (0.0.3)
       jekyll (~> 3.3)
-    jekyll-redirect-from (0.13.0)
+    jekyll-redirect-from (0.14.0)
       jekyll (~> 3.3)
     jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
@@ -39,11 +39,11 @@ GEM
       htmlbeautifier
       htmlcompressor
       jekyll
-    jekyll-toc (0.5.1)
-      nokogiri (~> 1.6)
+    jekyll-toc (0.6.0)
+      nokogiri (~> 1.7)
     jekyll-watch (2.0.0)
       listen (~> 3.0)
-    kramdown (1.16.2)
+    kramdown (1.17.0)
     liquid (4.0.0)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -51,18 +51,18 @@ GEM
       ruby_dep (~> 1.2)
     mercenary (0.3.6)
     mini_portile2 (2.3.0)
-    nokogiri (1.8.2)
+    nokogiri (1.8.4)
       mini_portile2 (~> 2.3.0)
     pathutil (0.16.1)
       forwardable-extended (~> 2.6)
-    public_suffix (3.0.0)
-    rb-fsevent (0.10.2)
+    public_suffix (3.0.2)
+    rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
     rouge (3.1.1)
     ruby_dep (1.5.0)
     safe_yaml (1.0.4)
-    sass (3.5.5)
+    sass (3.5.7)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -76,7 +76,7 @@ DEPENDENCIES
   jekyll-redirect-from!
   jekyll-tidy!
   jekyll-toc!
-  public_suffix (= 3.0.0)!
+  public_suffix (= 3.0.2)!
 
 BUNDLED WITH
-   1.16.1
+   1.16.3

package.json

@@ -39,7 +39,7 @@
     "gulp-autoprefixer": "^5.0.0",
     "gulp-rename": "^1.2.2",
     "gulp-rtlcss": "^1.2.0",
-    "gulp-sass": "^3.1.0",
+    "gulp-sass": "^4.0.1",
     "bootstrap": "^4.1.0",
     "npm-run-all": "^4.1.2"
   },