Update Slate sample's dependencies

Closes spring-projectsgh-563

Author: wilkinsona

samples/rest-notes-slate/slate/Gemfile.lock

@@ -1,42 +1,42 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.0.1)
+    activesupport (5.0.7)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (~> 0.7)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.0)
-      public_suffix (~> 2.0, >= 2.0.2)
-    autoprefixer-rails (6.6.1)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
+    autoprefixer-rails (6.7.7.2)
       execjs
-    backports (3.6.8)
+    backports (3.11.4)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
-    concurrent-ruby (1.0.4)
+    concurrent-ruby (1.1.3)
     contracts (0.13.0)
-    dotenv (2.2.0)
+    dotenv (2.5.0)
     erubis (2.7.0)
     execjs (2.7.0)
     fast_blank (1.0.0)
-    fastimage (2.0.1)
-      addressable (~> 2)
-    ffi (1.9.17)
-    haml (4.0.7)
+    fastimage (2.1.4)
+    ffi (1.9.25)
+    haml (5.0.4)
+      temple (>= 0.8.0)
       tilt
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
-    hashie (3.5.1)
+    hashie (3.6.0)
     i18n (0.7.0)
-    kramdown (1.13.2)
+    kramdown (1.17.0)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    memoist (0.15.0)
+    memoist (0.16.0)
     middleman (4.2.1)
       coffee-script (~> 2.2)
       compass-import-once (= 1.0.5)
@@ -73,38 +73,39 @@ GEM
       servolux
       tilt (~> 2.0)
       uglifier (~> 3.0)
-    middleman-sprockets (4.1.0)
+    middleman-sprockets (4.1.1)
       middleman-core (~> 4.0)
       sprockets (>= 3.0)
     middleman-syntax (3.0.0)
       middleman-core (>= 3.2)
       rouge (~> 2.0)
-    minitest (5.10.1)
-    padrino-helpers (0.13.3.3)
+    minitest (5.11.3)
+    padrino-helpers (0.13.3.4)
       i18n (~> 0.6, >= 0.6.7)
-      padrino-support (= 0.13.3.3)
+      padrino-support (= 0.13.3.4)
       tilt (>= 1.4.1, < 3)
-    padrino-support (0.13.3.3)
+    padrino-support (0.13.3.4)
       activesupport (>= 3.1)
-    parallel (1.10.0)
-    public_suffix (2.0.5)
-    rack (2.0.1)
-    rb-fsevent (0.9.8)
-    rb-inotify (0.9.8)
-      ffi (>= 0.5.0)
+    parallel (1.12.1)
+    public_suffix (3.0.3)
+    rack (2.0.6)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
     redcarpet (3.4.0)
     rouge (2.0.7)
-    sass (3.4.23)
-    servolux (0.12.0)
-    sprockets (3.7.1)
+    sass (3.4.25)
+    servolux (0.13.0)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    thor (0.19.4)
-    thread_safe (0.3.5)
-    tilt (2.0.6)
-    tzinfo (1.2.2)
+    temple (0.8.0)
+    thor (0.20.3)
+    thread_safe (0.3.6)
+    tilt (2.0.8)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    uglifier (3.0.4)
+    uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)
 
 PLATFORMS
@@ -119,4 +120,4 @@ DEPENDENCIES
   rouge (~> 2.0.5)
 
 BUNDLED WITH
-   1.14.3
+   1.17.1