Merge pull request #19 from githubtraining/dependabot/bundler/test-unit-3.4.1

Author: dependabot[bot]

Gemfile.lock

@@ -228,7 +228,7 @@ GEM
       sawyer (~> 0.8.0, >= 0.5.3)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    power_assert (1.2.0)
+    power_assert (2.0.0)
     public_suffix (4.0.6)
     racc (1.5.2)
     rb-fsevent (0.11.0)
@@ -253,7 +253,7 @@ GEM
       unf (~> 0.1.4)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
-    test-unit (3.3.9)
+    test-unit (3.4.1)
       power_assert
     thread_safe (0.3.6)
     typhoeus (1.4.0)