Bump rspec from 3.7.0 to 3.8.0 (#8)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -90,19 +90,19 @@ GEM
     rainbow (2.2.2)
       rake
     rake (12.3.2)
-    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 (3.8.2)
       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)
     rubocop (0.49.1)
       parallel (~> 1.10)
       parser (>= 2.3.3.1, < 3.0)