Bump coveralls from 0.8.21 to 0.8.22

Bumps [coveralls](https://coveralls.io) from 0.8.21 to 0.8.22.

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile.lock

@@ -15,17 +15,17 @@ GEM
       ffi (~> 1.0, >= 1.0.11)
     coderay (1.1.2)
     concurrent-ruby (1.0.5)
-    coveralls (0.8.21)
+    coveralls (0.8.22)
       json (>= 1.8, < 3)
-      simplecov (~> 0.14.1)
+      simplecov (~> 0.16.1)
       term-ansicolor (~> 1.3)
       thor (~> 0.19.4)
       tins (~> 1.6)
     debase (0.2.2)
       debase-ruby_core_source (>= 0.10.2)
     debase-ruby_core_source (0.10.2)
     diff-lcs (1.3)
-    docile (1.1.5)
+    docile (1.3.1)
     emot (0.0.4)
       thor
     faraday (0.15.1)
@@ -93,8 +93,8 @@ GEM
       childprocess (~> 0.5)
       rubyzip (~> 1.2)
     sequel (5.9.0)
-    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 (0.10.2)