Update danger (#232)

Gemfile.lock

@@ -56,14 +56,14 @@ GEM
     concurrent-ruby (1.1.5)
     cork (0.3.0)
       colored2 (~> 3.1)
-    danger (6.2.0)
+    danger (8.0.4)
       claide (~> 1.0)
       claide-plugins (>= 0.9.2)
       colored2 (~> 3.1)
       cork (~> 0.1)
-      faraday (~> 0.9)
+      faraday (>= 0.9.0, < 2.0)
       faraday-http-cache (~> 2.0)
-      git (~> 1.5)
+      git (~> 1.7)
       kramdown (~> 2.0)
       kramdown-parser-gfm (~> 1.0)
       no_proxy_fix
@@ -87,8 +87,8 @@ GEM
     faraday-cookie_jar (0.0.6)
       faraday (>= 0.7.4)
       http-cookie (~> 1.0.0)
-    faraday-http-cache (2.0.0)
-      faraday (~> 0.8)
+    faraday-http-cache (2.2.0)
+      faraday (>= 0.8)
     faraday_middleware (0.13.1)
       faraday (>= 0.7.4, < 1.0)
     fastimage (2.1.7)
@@ -132,7 +132,7 @@ GEM
     fourflusher (2.3.1)
     fuzzy_match (2.0.4)
     gh_inspector (1.1.3)
-    git (1.6.0)
+    git (1.7.0)
       rchardet (~> 1.8)
     google-api-client (0.36.4)
       addressable (~> 2.5, >= 2.5.1)
@@ -170,7 +170,8 @@ GEM
       concurrent-ruby (~> 1.0)
     json (2.3.0)
     jwt (2.1.0)
-    kramdown (2.1.0)
+    kramdown (2.3.0)
+      rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     memoist (0.16.2)
@@ -186,7 +187,7 @@ GEM
     naturally (2.2.0)
     netrc (0.11.0)
     no_proxy_fix (0.1.2)
-    octokit (4.16.0)
+    octokit (4.18.0)
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
     open4 (1.3.4)
@@ -200,6 +201,7 @@ GEM
       declarative-option (< 0.2.0)
       uber (< 0.2.0)
     retriable (3.1.2)
+    rexml (3.2.4)
     rouge (2.0.7)
     ruby-macho (1.4.0)
     rubyzip (1.3.0)
@@ -231,7 +233,7 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.6)
-    unicode-display_width (1.6.1)
+    unicode-display_width (1.7.0)
     word_wrap (1.0.0)
     xcodeproj (1.15.0)
       CFPropertyList (>= 2.3.3, < 4.0)