Bump coveralls from 0.8.22 to 0.8.23

Bumps [coveralls](https://coveralls.io) from 0.8.22 to 0.8.23.

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

Gemfile.lock

@@ -70,11 +70,11 @@ GEM
       nokogiri (~> 1.8)
     concurrent-ruby (1.1.5)
     config-parser (0.3.0)
-    coveralls (0.8.22)
+    coveralls (0.8.23)
       json (>= 1.8, < 3)
       simplecov (~> 0.16.1)
       term-ansicolor (~> 1.3)
-      thor (~> 0.19.4)
+      thor (>= 0.19.4, < 2.0)
       tins (~> 1.6)
     crass (1.0.4)
     diff-lcs (1.3)
@@ -93,7 +93,7 @@ GEM
       concurrent-ruby (~> 1.0)
     io-like (0.3.0)
     jaro_winkler (1.5.2)
-    json (2.1.0)
+    json (2.2.0)
     loofah (2.2.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
@@ -196,12 +196,12 @@ GEM
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
     temple (0.8.0)
-    term-ansicolor (1.6.0)
+    term-ansicolor (1.7.1)
       tins (~> 1.0)
-    thor (0.19.4)
+    thor (0.20.3)
     thread_safe (0.3.6)
     tilt (2.0.8)
-    tins (1.17.0)
+    tins (1.20.2)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
     uglifier (4.1.20)