Update gems

Gemfile.lock

@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.2.4.4)
+    activesupport (5.2.5)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
@@ -10,19 +10,19 @@ GEM
       public_suffix (>= 2.0.2, < 5.0)
     autoprefixer-rails (9.8.6.5)
       execjs
-    backports (3.18.2)
+    backports (3.20.2)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.1.7)
+    concurrent-ruby (1.1.8)
     contracts (0.13.0)
     dotenv (2.7.6)
     erubis (2.7.0)
     execjs (2.7.0)
     fast_blank (1.0.0)
-    fastimage (2.2.0)
-    ffi (1.13.1)
+    fastimage (2.2.3)
+    ffi (1.15.0)
     haml (5.2.1)
       temple (>= 0.8.0)
       tilt
@@ -31,7 +31,7 @@ GEM
     hashie (3.6.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    kramdown (2.3.0)
+    kramdown (2.3.1)
       rexml
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -71,7 +71,7 @@ GEM
       servolux
       tilt (~> 2.0.9)
       uglifier (~> 3.0)
-    minitest (5.14.2)
+    minitest (5.14.4)
     padrino-helpers (0.13.3.4)
       i18n (~> 0.6, >= 0.6.7)
       padrino-support (= 0.13.3.4)
@@ -81,7 +81,7 @@ GEM
     parallel (1.20.1)
     public_suffix (4.0.6)
     rack (2.2.3)
-    rake (13.0.1)
+    rake (13.0.3)
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -90,10 +90,10 @@ GEM
       ffi (~> 1.9)
     servolux (0.13.0)
     temple (0.8.2)
-    thor (1.0.1)
+    thor (1.1.0)
     thread_safe (0.3.6)
     tilt (2.0.10)
-    tzinfo (1.2.8)
+    tzinfo (1.2.9)
       thread_safe (~> 0.1)
     uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)
@@ -111,4 +111,4 @@ DEPENDENCIES
   webrick
 
 BUNDLED WITH
-   2.2.4
+   2.2.15