build(deps): bump middleman-livereload from 3.4.6 to 3.4.7 in /docs/v3

docs/v3/Gemfile.lock

@@ -1,7 +1,7 @@
 GEM
   remote: http://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)
@@ -10,12 +10,12 @@ GEM
       public_suffix (>= 2.0.2, < 5.0)
     autoprefixer-rails (9.8.6.5)
       execjs
-    backports (3.18.2)
+    backports (3.21.0)
     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)
     em-websocket (0.5.2)
@@ -25,8 +25,8 @@ GEM
     eventmachine (1.2.7)
     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 (5.2.0)
       temple (>= 0.8.0)
       tilt
@@ -80,7 +80,7 @@ GEM
       uglifier (~> 3.0)
     middleman-gh-pages (0.4.1)
       rake (> 0.9.3)
-    middleman-livereload (3.4.6)
+    middleman-livereload (3.4.7)
       em-websocket (~> 0.5.1)
       middleman-core (>= 3.3)
       rack-livereload (~> 0.3.15)
@@ -93,7 +93,7 @@ GEM
     mini_portile2 (2.4.0)
     mini_racer (0.3.1)
       libv8 (~> 8.4.255)
-    minitest (5.14.2)
+    minitest (5.14.4)
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     padrino-helpers (0.13.3.4)
@@ -102,7 +102,7 @@ GEM
       tilt (>= 1.4.1, < 3)
     padrino-support (0.13.3.4)
       activesupport (>= 3.1)
-    parallel (1.19.2)
+    parallel (1.20.1)
     public_suffix (4.0.6)
     rack (2.2.3)
     rack-livereload (0.3.17)
@@ -129,7 +129,7 @@ GEM
     thor (1.0.1)
     thread_safe (0.3.6)
     tilt (2.0.10)
-    tzinfo (1.2.7)
+    tzinfo (1.2.9)
       thread_safe (~> 0.1)
     uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)