Update simplecov to avoid invalid UTF-8 crashes

Signed-off-by: Rémy Coutable <remy@rymai.me>

Gemfile

@@ -376,7 +376,7 @@ group :development, :test do
 
   gem 'scss_lint', '~> 0.56.0', require: false
   gem 'haml_lint', '~> 0.31.0', require: false
-  gem 'simplecov', '~> 0.14.0', require: false
+  gem 'simplecov', '~> 0.16.1', require: false
   gem 'bundler-audit', '~> 0.5.0', require: false
 
   gem 'benchmark-ips', '~> 2.3.0', require: false

Gemfile.lock

@@ -183,7 +183,7 @@ GEM
     diffy (3.1.0)
     discordrb-webhooks-blackst0ne (3.3.0)
       rest-client (~> 2.0)
-    docile (1.1.5)
+    docile (1.3.1)
     domain_name (0.5.20180417)
       unf (>= 0.0.5, < 1.0.0)
     doorkeeper (4.3.2)
@@ -904,11 +904,11 @@ GEM
       jwt (>= 1.5, < 3.0)
       multi_json (~> 1.10)
     simple_po_parser (1.1.2)
-    simplecov (0.14.1)
-      docile (~> 1.1.0)
+    simplecov (0.16.1)
+      docile (~> 1.1)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
-    simplecov-html (0.10.0)
+    simplecov-html (0.10.2)
     slack-notifier (1.5.1)
     snowplow-tracker (0.6.1)
       contracts (~> 0.7, <= 0.11)
@@ -1247,7 +1247,7 @@ DEPENDENCIES
   sidekiq (~> 5.2.7)
   sidekiq-cron (~> 1.0)
   simple_po_parser (~> 1.1.2)
-  simplecov (~> 0.14.0)
+  simplecov (~> 0.16.1)
   slack-notifier (~> 1.5.1)
   snowplow-tracker (~> 0.6.1)
   spring (~> 2.0.0)