update coveralls

Gemfile.lock

@@ -69,15 +69,15 @@ GEM
       nokogiri (~> 1.8)
     concurrent-ruby (1.0.5)
     config-parser (0.3.0)
-    coveralls (0.7.2)
-      multi_json (~> 1.3)
-      rest-client (= 1.6.7)
-      simplecov (>= 0.7)
-      term-ansicolor (= 1.2.2)
-      thor (= 0.18.1)
+    coveralls (0.8.22)
+      json (>= 1.8, < 3)
+      simplecov (~> 0.16.1)
+      term-ansicolor (~> 1.3)
+      thor (~> 0.19.4)
+      tins (~> 1.6)
     crass (1.0.4)
     diff-lcs (1.3)
-    docile (1.3.0)
+    docile (1.3.1)
     erubis (2.7.0)
     eventmachine (1.0.9)
     execjs (2.7.0)
@@ -98,13 +98,9 @@ GEM
       nokogiri (>= 1.5.9)
     mail (2.7.0)
       mini_mime (>= 0.1.1)
-    mime-types (3.2.2)
-      mime-types-data (~> 3.2015)
-    mime-types-data (3.2018.0812)
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
-    multi_json (1.13.1)
     nokogiri (1.8.2)
       mini_portile2 (~> 2.3.0)
     parallel (1.12.1)
@@ -151,8 +147,6 @@ GEM
     rainbow (3.0.0)
     raindrops (0.19.0)
     rake (12.3.1)
-    rest-client (1.6.7)
-      mime-types (>= 1.16)
     rspec-core (3.7.1)
       rspec-support (~> 3.7.0)
     rspec-expectations (3.7.0)
@@ -200,12 +194,12 @@ GEM
       sprockets (>= 2.8, < 4.0)
     sqlite3 (1.3.13)
     temple (0.8.0)
-    term-ansicolor (1.2.2)
-      tins (~> 0.8)
-    thor (0.18.1)
+    term-ansicolor (1.6.0)
+      tins (~> 1.0)
+    thor (0.19.4)
     thread_safe (0.3.6)
     tilt (2.0.8)
-    tins (0.13.2)
+    tins (1.17.0)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
     uglifier (4.1.9)