Update rubocop-rspec to version 1.38.0 (#129)

Gemfile.lock

@@ -92,7 +92,7 @@ GEM
     nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
     parallel (1.19.1)
-    parser (2.7.0.1)
+    parser (2.7.0.2)
       ast (~> 2.4.0)
     pry (0.12.2)
       coderay (~> 1.1.0)
@@ -152,7 +152,7 @@ GEM
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 1.7)
-    rubocop-rspec (1.37.1)
+    rubocop-rspec (1.38.0)
       rubocop (>= 0.68.1)
     ruby-progressbar (1.10.1)
     sprockets (4.0.0)
@@ -167,7 +167,7 @@ GEM
     thread_safe (0.3.6)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    unicode-display_width (1.6.0)
+    unicode-display_width (1.6.1)
     websocket-driver (0.7.1)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.4)