chore(deps-dev): bump irb from 1.8.3 to 1.9.0 (#541)

Author: adamjmcgrath

Gemfile.lock

@@ -93,7 +93,7 @@ GEM
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
     io-console (0.6.0)
-    irb (1.8.3)
+    irb (1.9.0)
       rdoc
       reline (>= 0.3.8)
     json (2.6.3)
@@ -168,10 +168,10 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rdoc (6.5.0)
+    rdoc (6.6.0)
       psych (>= 4.0.0)
     regexp_parser (2.8.2)
-    reline (0.3.9)
+    reline (0.4.0)
       io-console (~> 0.5)
     rest-client (2.1.0)
       http-accept (>= 1.7.0, < 2.0)
@@ -222,7 +222,7 @@ GEM
       simplecov (~> 0.19)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    stringio (3.0.8)
+    stringio (3.0.9)
     sync (0.5.0)
     term-ansicolor (1.7.1)
       tins (~> 1.0)