Bump rspec from 3.7.0 to 3.8.0

Bumps [rspec](https://github.com/rspec/rspec) from 3.7.0 to 3.8.0.
- [Release notes](https://github.com/rspec/rspec/releases)
- [Commits](https://github.com/rspec/rspec/compare/v3.7.0...v3.8.0)

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

Gemfile.lock

@@ -70,19 +70,19 @@ GEM
       rack-test (>= 0.5)
     rake (12.3.1)
     redcarpet (3.4.0)
-    rspec (3.7.0)
-      rspec-core (~> 3.7.0)
-      rspec-expectations (~> 3.7.0)
-      rspec-mocks (~> 3.7.0)
-    rspec-core (3.7.1)
-      rspec-support (~> 3.7.0)
-    rspec-expectations (3.7.0)
+    rspec (3.8.0)
+      rspec-core (~> 3.8.0)
+      rspec-expectations (~> 3.8.0)
+      rspec-mocks (~> 3.8.0)
+    rspec-core (3.8.0)
+      rspec-support (~> 3.8.0)
+    rspec-expectations (3.8.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.7.0)
-    rspec-mocks (3.7.0)
+      rspec-support (~> 3.8.0)
+    rspec-mocks (3.8.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.7.0)
-    rspec-support (3.7.1)
+      rspec-support (~> 3.8.0)
+    rspec-support (3.8.0)
     ruby-debug-ide (0.6.1)
       rake (>= 0.8.1)
     rubyzip (1.2.1)